391132377 has 6 divisors (see below), whose sum is σ = 564969002. Its totient is φ = 260754912.

The previous prime is 391132369. The next prime is 391132381. The reversal of 391132377 is 773231193.

It can be written as a sum of positive squares in only one way, i.e., 342398016 + 48734361 = 18504^2 + 6981^2 .

It is not a de Polignac number, because 391132377 - 2³ = 391132369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391132337) 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, 21729568 + ... + 21729585.

Almost surely, 2^391132377 is an apocalyptic number.

It is an amenable number.

391132377 is a deficient number, since it is larger than the sum of its proper divisors (173836625).

391132377 is a wasteful number, since it uses less digits than its factorization.

391132377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43459159 (or 43459156 counting only the distinct ones).

The product of its digits is 23814, while the sum is 36.

The square root of 391132377 is about 19777.0669463396. The cubic root of 391132377 is about 731.3207945485.

The spelling of 391132377 in words is "three hundred ninety-one million, one hundred thirty-two thousand, three hundred seventy-seven".