1021255061 has 4 divisors (see below), whose sum is σ = 1026546732. Its totient is φ = 1015963392.

The previous prime is 1021255051. The next prime is 1021255063. The reversal of 1021255061 is 1605521201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1605521201 = 67 ⋅23963003.

It can be written as a sum of positive squares in 2 ways, for example, as 146870161 + 874384900 = 12119^2 + 29570^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021255061 - 2¹⁴ = 1021238677 is a prime.

It is a super-2 number, since 2×1021255061² = 2085923799236227442, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021255063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2645546 + ... + 2645931.

It is an arithmetic number, because the mean of its divisors is an integer number (256636683).

Almost surely, 2^1021255061 is an apocalyptic number.

It is an amenable number.

1021255061 is a deficient number, since it is larger than the sum of its proper divisors (5291671).

1021255061 is an equidigital number, since it uses as much as digits as its factorization.

1021255061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5291670.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 1021255061 is about 31957.0815469748. The cubic root of 1021255061 is about 1007.0354073004.

Adding to 1021255061 its reverse (1605521201), we get a palindrome (2626776262).

The spelling of 1021255061 in words is "one billion, twenty-one million, two hundred fifty-five thousand, sixty-one".