812495557 has 4 divisors (see below), whose sum is σ = 815895360. Its totient is φ = 809095756.

The previous prime is 812495531. The next prime is 812495561. The reversal of 812495557 is 755594218.

812495557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 an emirpimes, since its reverse is a distinct semiprime: 755594218 = 2 ⋅377797109.

It is a cyclic number.

It is not a de Polignac number, because 812495557 - 2⁷ = 812495429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812495357) 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, 1699543 + ... + 1700020.

It is an arithmetic number, because the mean of its divisors is an integer number (203973840).

Almost surely, 2^812495557 is an apocalyptic number.

It is an amenable number.

812495557 is a deficient number, since it is larger than the sum of its proper divisors (3399803).

812495557 is a wasteful number, since it uses less digits than its factorization.

812495557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3399802.

The product of its digits is 504000, while the sum is 46.

The square root of 812495557 is about 28504.3076919963. The cubic root of 812495557 is about 933.1260883246.

The spelling of 812495557 in words is "eight hundred twelve million, four hundred ninety-five thousand, five hundred fifty-seven".