77652521 has 2 divisors, whose sum is σ = 77652522. Its totient is φ = 77652520.

The previous prime is 77652511. The next prime is 77652541. The reversal of 77652521 is 12525677.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77440000 + 212521 = 8800^2 + 461^2 .

It is an emirp because it is prime and its reverse (12525677) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77652521 - 2⁶ = 77652457 is a prime.

It is not a weakly prime, because it can be changed into another prime (77652511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38826260 + 38826261.

It is an arithmetic number, because the mean of its divisors is an integer number (38826261).

Almost surely, 2^77652521 is an apocalyptic number.

It is an amenable number.

77652521 is a deficient number, since it is larger than the sum of its proper divisors (1).

77652521 is an equidigital number, since it uses as much as digits as its factorization.

77652521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29400, while the sum is 35.

The square root of 77652521 is about 8812.0667836779. The cubic root of 77652521 is about 426.6304539443.

The spelling of 77652521 in words is "seventy-seven million, six hundred fifty-two thousand, five hundred twenty-one".