690519901 has 2 divisors, whose sum is σ = 690519902. Its totient is φ = 690519900.

The previous prime is 690519859. The next prime is 690519919. The reversal of 690519901 is 109915096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 571688100 + 118831801 = 23910^2 + 10901^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690519901 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690519941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345259950 + 345259951.

It is an arithmetic number, because the mean of its divisors is an integer number (345259951).

Almost surely, 2^690519901 is an apocalyptic number.

It is an amenable number.

690519901 is a deficient number, since it is larger than the sum of its proper divisors (1).

690519901 is an equidigital number, since it uses as much as digits as its factorization.

690519901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21870, while the sum is 40.

The square root of 690519901 is about 26277.7453560993. The cubic root of 690519901 is about 883.8774753747.

The spelling of 690519901 in words is "six hundred ninety million, five hundred nineteen thousand, nine hundred one".