365172487921 has 2 divisors, whose sum is σ = 365172487922. Its totient is φ = 365172487920.

The previous prime is 365172487871. The next prime is 365172487931. The reversal of 365172487921 is 129784271563.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 347199063696 + 17973424225 = 589236^2 + 134065^2 .

It is a cyclic number.

It is not a de Polignac number, because 365172487921 - 2¹³ = 365172479729 is a prime.

It is not a weakly prime, because it can be changed into another prime (365172487931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182586243960 + 182586243961.

It is an arithmetic number, because the mean of its divisors is an integer number (182586243961).

Almost surely, 2^365172487921 is an apocalyptic number.

It is an amenable number.

365172487921 is a deficient number, since it is larger than the sum of its proper divisors (1).

365172487921 is an equidigital number, since it uses as much as digits as its factorization.

365172487921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 55.

The spelling of 365172487921 in words is "three hundred sixty-five billion, one hundred seventy-two million, four hundred eighty-seven thousand, nine hundred twenty-one".