815494651 has 2 divisors, whose sum is σ = 815494652. Its totient is φ = 815494650.

The previous prime is 815494639. The next prime is 815494747. The reversal of 815494651 is 156494518.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 815494651 - 2²⁵ = 781940219 is a prime.

It is a super-2 number, since 2×815494651² = 1330063051619223602, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 815494598 and 815494607.

It is not a weakly prime, because it can be changed into another prime (815494621) 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, 407747325 + 407747326.

It is an arithmetic number, because the mean of its divisors is an integer number (407747326).

Almost surely, 2^815494651 is an apocalyptic number.

815494651 is a deficient number, since it is larger than the sum of its proper divisors (1).

815494651 is an equidigital number, since it uses as much as digits as its factorization.

815494651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 43.

The square root of 815494651 is about 28556.8669675089. The cubic root of 815494651 is about 934.2728008802.

The spelling of 815494651 in words is "eight hundred fifteen million, four hundred ninety-four thousand, six hundred fifty-one".