290897531 has 2 divisors, whose sum is σ = 290897532. Its totient is φ = 290897530.

The previous prime is 290897483. The next prime is 290897573. The reversal of 290897531 is 135798092.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 290897531 - 2¹⁴ = 290881147 is a prime.

It is a super-2 number, since 2×290897531² = 169242747083791922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (290897731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145448765 + 145448766.

It is an arithmetic number, because the mean of its divisors is an integer number (145448766).

Almost surely, 2^290897531 is an apocalyptic number.

290897531 is a deficient number, since it is larger than the sum of its proper divisors (1).

290897531 is an equidigital number, since it uses as much as digits as its factorization.

290897531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 290897531 is about 17055.7184252086. The cubic root of 290897531 is about 662.5927481873.

The spelling of 290897531 in words is "two hundred ninety million, eight hundred ninety-seven thousand, five hundred thirty-one".