204904531491 has 16 divisors (see below), whose sum is σ = 298731296640. Its totient is φ = 123897755520.

The previous prime is 204904531477. The next prime is 204904531511. The reversal of 204904531491 is 194135409402.

It is not a de Polignac number, because 204904531491 - 2⁹ = 204904530979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (204904531411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7155721 + ... + 7184298.

It is an arithmetic number, because the mean of its divisors is an integer number (18670706040).

Almost surely, 2^204904531491 is an apocalyptic number.

204904531491 is a deficient number, since it is larger than the sum of its proper divisors (93826765149).

204904531491 is a wasteful number, since it uses less digits than its factorization.

204904531491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14340466.

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 204904531491 in words is "two hundred four billion, nine hundred four million, five hundred thirty-one thousand, four hundred ninety-one".