204151515431 has 2 divisors, whose sum is σ = 204151515432. Its totient is φ = 204151515430.

The previous prime is 204151515413. The next prime is 204151515487. The reversal of 204151515431 is 134515151402.

Together with previous prime (204151515413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 204151515431 - 2¹⁰ = 204151514407 is a prime.

It is a super-2 number, since 2×204151515431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204151515131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102075757715 + 102075757716.

It is an arithmetic number, because the mean of its divisors is an integer number (102075757716).

Almost surely, 2^204151515431 is an apocalyptic number.

204151515431 is a deficient number, since it is larger than the sum of its proper divisors (1).

204151515431 is an equidigital number, since it uses as much as digits as its factorization.

204151515431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12000, while the sum is 32.

Adding to 204151515431 its reverse (134515151402), we get a palindrome (338666666833).

The spelling of 204151515431 in words is "two hundred four billion, one hundred fifty-one million, five hundred fifteen thousand, four hundred thirty-one".