691939053 has 24 divisors (see below), whose sum is σ = 1084848128. Its totient is φ = 422446752.

The previous prime is 691939051. The next prime is 691939063. The reversal of 691939053 is 350939196.

It is not a de Polignac number, because 691939053 - 2¹ = 691939051 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691939051) 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 in 23 ways as a sum of consecutive naturals, for example, 8425 + ... + 38142.

Almost surely, 2^691939053 is an apocalyptic number.

It is an amenable number.

691939053 is a deficient number, since it is larger than the sum of its proper divisors (392909075).

691939053 is a wasteful number, since it uses less digits than its factorization.

691939053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46713 (or 46710 counting only the distinct ones).

The product of its (nonzero) digits is 196830, while the sum is 45.

The square root of 691939053 is about 26304.7344217728. The cubic root of 691939053 is about 884.4825741077.

The spelling of 691939053 in words is "six hundred ninety-one million, nine hundred thirty-nine thousand, fifty-three".