772538561 has 4 divisors (see below), whose sum is σ = 772602624. Its totient is φ = 772474500.

The previous prime is 772538549. The next prime is 772538563. The reversal of 772538561 is 165835277.

It is a happy number.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 165835277 = 181 ⋅916217.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-772538561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (772538563) 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, 7865 + ... + 40086.

It is an arithmetic number, because the mean of its divisors is an integer number (193150656).

Almost surely, 2^772538561 is an apocalyptic number.

It is an amenable number.

772538561 is a deficient number, since it is larger than the sum of its proper divisors (64063).

772538561 is a wasteful number, since it uses less digits than its factorization.

772538561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64062.

The product of its digits is 352800, while the sum is 44.

The square root of 772538561 is about 27794.5779064910. The cubic root of 772538561 is about 917.5717949991.

The spelling of 772538561 in words is "seven hundred seventy-two million, five hundred thirty-eight thousand, five hundred sixty-one".