205490831 has 16 divisors (see below), whose sum is σ = 253667904. Its totient is φ = 162100224.

The previous prime is 205490807. The next prime is 205490837. The reversal of 205490831 is 138094502.

It is not a de Polignac number, because 205490831 - 2¹⁴ = 205474447 is a prime.

It is a super-2 number, since 2×205490831² = 84452963250141122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205490837) 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, 28925 + ... + 35321.

It is an arithmetic number, because the mean of its divisors is an integer number (15854244).

Almost surely, 2^205490831 is an apocalyptic number.

205490831 is a deficient number, since it is larger than the sum of its proper divisors (48177073).

205490831 is a wasteful number, since it uses less digits than its factorization.

205490831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6770.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 205490831 is about 14334.9513776643. The cubic root of 205490831 is about 590.1070676132.

The spelling of 205490831 in words is "two hundred five million, four hundred ninety thousand, eight hundred thirty-one".