231649377 has 4 divisors (see below), whose sum is σ = 308865840. Its totient is φ = 154432916.

The previous prime is 231649373. The next prime is 231649393. The reversal of 231649377 is 773946132.

231649377 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231649377 - 2² = 231649373 is a prime.

It is a super-2 number, since 2×231649377² = 107322867728976258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231649373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38608227 + ... + 38608232.

It is an arithmetic number, because the mean of its divisors is an integer number (77216460).

Almost surely, 2^231649377 is an apocalyptic number.

It is an amenable number.

231649377 is a deficient number, since it is larger than the sum of its proper divisors (77216463).

231649377 is an equidigital number, since it uses as much as digits as its factorization.

231649377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77216462.

The product of its digits is 190512, while the sum is 42.

The square root of 231649377 is about 15220.0320958926. The cubic root of 231649377 is about 614.1536616686.

The spelling of 231649377 in words is "two hundred thirty-one million, six hundred forty-nine thousand, three hundred seventy-seven".