765272021 has 2 divisors, whose sum is σ = 765272022. Its totient is φ = 765272020.

The previous prime is 765272003. The next prime is 765272041. The reversal of 765272021 is 120272567.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 762532996 + 2739025 = 27614^2 + 1655^2 .

It is a cyclic number.

It is not a de Polignac number, because 765272021 - 2²² = 761077717 is a prime.

It is a super-2 number, since 2×765272021² = 1171282532250848882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (765272041) 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 as a sum of consecutive naturals, namely, 382636010 + 382636011.

It is an arithmetic number, because the mean of its divisors is an integer number (382636011).

Almost surely, 2^765272021 is an apocalyptic number.

It is an amenable number.

765272021 is a deficient number, since it is larger than the sum of its proper divisors (1).

765272021 is an equidigital number, since it uses as much as digits as its factorization.

765272021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 765272021 is about 27663.5504048197. The cubic root of 765272021 is about 914.6858172613.

The spelling of 765272021 in words is "seven hundred sixty-five million, two hundred seventy-two thousand, twenty-one".