691301157 has 8 divisors (see below), whose sum is σ = 923875200. Its totient is φ = 459797280.

The previous prime is 691301137. The next prime is 691301173. The reversal of 691301157 is 751103196.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-691301157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691301137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266032 + ... + 268617.

It is an arithmetic number, because the mean of its divisors is an integer number (115484400).

Almost surely, 2^691301157 is an apocalyptic number.

It is an amenable number.

691301157 is a deficient number, since it is larger than the sum of its proper divisors (232574043).

691301157 is a wasteful number, since it uses less digits than its factorization.

691301157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535083.

The product of its (nonzero) digits is 5670, while the sum is 33.

The square root of 691301157 is about 26292.6065082943. The cubic root of 691301157 is about 884.2106901593.

The spelling of 691301157 in words is "six hundred ninety-one million, three hundred one thousand, one hundred fifty-seven".