691696253 has 2 divisors, whose sum is σ = 691696254. Its totient is φ = 691696252.

The previous prime is 691696249. The next prime is 691696297. The reversal of 691696253 is 352696196.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 461476324 + 230219929 = 21482^2 + 15173^2 .

It is a cyclic number.

It is not a de Polignac number, because 691696253 - 2² = 691696249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 691696198 and 691696207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691696553) 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, 345848126 + 345848127.

It is an arithmetic number, because the mean of its divisors is an integer number (345848127).

Almost surely, 2^691696253 is an apocalyptic number.

It is an amenable number.

691696253 is a deficient number, since it is larger than the sum of its proper divisors (1).

691696253 is an equidigital number, since it uses as much as digits as its factorization.

691696253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 524880, while the sum is 47.

The square root of 691696253 is about 26300.1188780583. The cubic root of 691696253 is about 884.3791076287.

The spelling of 691696253 in words is "six hundred ninety-one million, six hundred ninety-six thousand, two hundred fifty-three".