690623753 has 2 divisors, whose sum is σ = 690623754. Its totient is φ = 690623752.

The previous prime is 690623749. The next prime is 690623807. The reversal of 690623753 is 357326096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 690217984 + 405769 = 26272^2 + 637^2 .

It is a cyclic number.

It is not a de Polignac number, because 690623753 - 2² = 690623749 is a prime.

It is a super-3 number, since 3×690623753³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 690623753.

It is not a weakly prime, because it can be changed into another prime (690622753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345311876 + 345311877.

It is an arithmetic number, because the mean of its divisors is an integer number (345311877).

Almost surely, 2^690623753 is an apocalyptic number.

It is an amenable number.

690623753 is a deficient number, since it is larger than the sum of its proper divisors (1).

690623753 is an equidigital number, since it uses as much as digits as its factorization.

690623753 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 41.

The square root of 690623753 is about 26279.7213265286. The cubic root of 690623753 is about 883.9217839419.

The spelling of 690623753 in words is "six hundred ninety million, six hundred twenty-three thousand, seven hundred fifty-three".