690989743 has 2 divisors, whose sum is σ = 690989744. Its totient is φ = 690989742.

The previous prime is 690989737. The next prime is 690989753. The reversal of 690989743 is 347989096.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690989743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690989753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345494871 + 345494872.

It is an arithmetic number, because the mean of its divisors is an integer number (345494872).

Almost surely, 2^690989743 is an apocalyptic number.

690989743 is a deficient number, since it is larger than the sum of its proper divisors (1).

690989743 is an equidigital number, since it uses as much as digits as its factorization.

690989743 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The square root of 690989743 is about 26286.6837581312. The cubic root of 690989743 is about 884.0778985666.

The spelling of 690989743 in words is "six hundred ninety million, nine hundred eighty-nine thousand, seven hundred forty-three".