204378431 has 2 divisors, whose sum is σ = 204378432. Its totient is φ = 204378430.

The previous prime is 204378407. The next prime is 204378509. The reversal of 204378431 is 134873402.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204378431 is a prime.

It is a super-2 number, since 2×204378431² = 83541086116043522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204378331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102189215 + 102189216.

It is an arithmetic number, because the mean of its divisors is an integer number (102189216).

Almost surely, 2^204378431 is an apocalyptic number.

204378431 is a deficient number, since it is larger than the sum of its proper divisors (1).

204378431 is an equidigital number, since it uses as much as digits as its factorization.

204378431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 204378431 is about 14296.0984537740. The cubic root of 204378431 is about 589.0403157375.

The spelling of 204378431 in words is "two hundred four million, three hundred seventy-eight thousand, four hundred thirty-one".