1061620251 has 4 divisors (see below), whose sum is σ = 1415493672. Its totient is φ = 707746832.

The previous prime is 1061620171. The next prime is 1061620253. The reversal of 1061620251 is 1520261601.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1061620251 - 2⁹ = 1061619739 is a prime.

It is a super-2 number, since 2×1061620251² = 2254075114666606002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1061620253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176936706 + ... + 176936711.

It is an arithmetic number, because the mean of its divisors is an integer number (353873418).

Almost surely, 2^1061620251 is an apocalyptic number.

1061620251 is a deficient number, since it is larger than the sum of its proper divisors (353873421).

1061620251 is an equidigital number, since it uses as much as digits as its factorization.

1061620251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353873420.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1061620251 is about 32582.5144978100. The cubic root of 1061620251 is about 1020.1320638308.

Adding to 1061620251 its reverse (1520261601), we get a palindrome (2581881852).

The spelling of 1061620251 in words is "one billion, sixty-one million, six hundred twenty thousand, two hundred fifty-one".