690686441 has 2 divisors, whose sum is σ = 690686442. Its totient is φ = 690686440.

The previous prime is 690686431. The next prime is 690686471. The reversal of 690686441 is 144686096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 671017216 + 19669225 = 25904^2 + 4435^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690686441 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 690686392 and 690686401.

It is not a weakly prime, because it can be changed into another prime (690686401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345343220 + 345343221.

It is an arithmetic number, because the mean of its divisors is an integer number (345343221).

Almost surely, 2^690686441 is an apocalyptic number.

It is an amenable number.

690686441 is a deficient number, since it is larger than the sum of its proper divisors (1).

690686441 is an equidigital number, since it uses as much as digits as its factorization.

690686441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 690686441 is about 26280.9140061757. The cubic root of 690686441 is about 883.9485276944.

The spelling of 690686441 in words is "six hundred ninety million, six hundred eighty-six thousand, four hundred forty-one".