690083491 has 2 divisors, whose sum is σ = 690083492. Its totient is φ = 690083490.

The previous prime is 690083489. The next prime is 690083519. The reversal of 690083491 is 194380096.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 690083491 - 2¹ = 690083489 is a prime.

Together with 690083489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (690093491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345041745 + 345041746.

It is an arithmetic number, because the mean of its divisors is an integer number (345041746).

Almost surely, 2^690083491 is an apocalyptic number.

690083491 is a deficient number, since it is larger than the sum of its proper divisors (1).

690083491 is an equidigital number, since it uses as much as digits as its factorization.

690083491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 690083491 is about 26269.4402490803. The cubic root of 690083491 is about 883.6912320054.

The spelling of 690083491 in words is "six hundred ninety million, eighty-three thousand, four hundred ninety-one".