691273923 has 16 divisors (see below), whose sum is σ = 952901376. Its totient is φ = 445413600.

The previous prime is 691273897. The next prime is 691273949. The reversal of 691273923 is 329372196.

It is an interprime number because it is at equal distance from previous prime (691273897) and next prime (691273949).

It is a de Polignac number, because none of the positive numbers 2^k-691273923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (691273423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3861 + ... + 37382.

It is an arithmetic number, because the mean of its divisors is an integer number (59556336).

Almost surely, 2^691273923 is an apocalyptic number.

691273923 is a deficient number, since it is larger than the sum of its proper divisors (261627453).

691273923 is a wasteful number, since it uses less digits than its factorization.

691273923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41434.

The product of its digits is 122472, while the sum is 42.

The square root of 691273923 is about 26292.0886009461. The cubic root of 691273923 is about 884.1990787654.

The spelling of 691273923 in words is "six hundred ninety-one million, two hundred seventy-three thousand, nine hundred twenty-three".