691919503 has 6 divisors (see below), whose sum is σ = 760539752. Its totient is φ = 629017620.

The previous prime is 691919483. The next prime is 691919513. The reversal of 691919503 is 305919196.

It is not a de Polignac number, because 691919503 - 2⁵ = 691919471 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 691919503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691919513) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2859051 + ... + 2859292.

Almost surely, 2^691919503 is an apocalyptic number.

691919503 is a deficient number, since it is larger than the sum of its proper divisors (68620249).

691919503 is a wasteful number, since it uses less digits than its factorization.

691919503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5718365 (or 5718354 counting only the distinct ones).

The product of its (nonzero) digits is 65610, while the sum is 43.

The square root of 691919503 is about 26304.3628130392. The cubic root of 691919503 is about 884.4742439920.

The spelling of 691919503 in words is "six hundred ninety-one million, nine hundred nineteen thousand, five hundred three".