690858431 has 2 divisors, whose sum is σ = 690858432. Its totient is φ = 690858430.

The previous prime is 690858409. The next prime is 690858457. The reversal of 690858431 is 134858096.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 690858431 - 2²² = 686664127 is a prime.

It is a super-2 number, since 2×690858431² = 954570743367563522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690858401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345429215 + 345429216.

It is an arithmetic number, because the mean of its divisors is an integer number (345429216).

Almost surely, 2^690858431 is an apocalyptic number.

690858431 is a deficient number, since it is larger than the sum of its proper divisors (1).

690858431 is an equidigital number, since it uses as much as digits as its factorization.

690858431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 690858431 is about 26284.1859489694. The cubic root of 690858431 is about 884.0218932048.

The spelling of 690858431 in words is "six hundred ninety million, eight hundred fifty-eight thousand, four hundred thirty-one".