1015061261 has 4 divisors (see below), whose sum is σ = 1022364000. Its totient is φ = 1007758524.

The previous prime is 1015061221. The next prime is 1015061269. The reversal of 1015061261 is 1621605101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1621605101 = 503 ⋅3223867.

It is a cyclic number.

It is not a de Polignac number, because 1015061261 - 2⁶ = 1015061197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1015061269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3651161 + ... + 3651438.

It is an arithmetic number, because the mean of its divisors is an integer number (255591000).

Almost surely, 2^1015061261 is an apocalyptic number.

It is an amenable number.

1015061261 is a deficient number, since it is larger than the sum of its proper divisors (7302739).

1015061261 is an equidigital number, since it uses as much as digits as its factorization.

1015061261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7302738.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 1015061261 is about 31860.0260671582. The cubic root of 1015061261 is about 1004.9954245149.

Adding to 1015061261 its reverse (1621605101), we get a palindrome (2636666362).

The spelling of 1015061261 in words is "one billion, fifteen million, sixty-one thousand, two hundred sixty-one".