331979977 has 4 divisors (see below), whose sum is σ = 379405696. Its totient is φ = 284554260.

The previous prime is 331979957. The next prime is 331980001. The reversal of 331979977 is 779979133.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 779979133 = 1381 ⋅564793.

It is a cyclic number.

It is not a de Polignac number, because 331979977 - 2²³ = 323591369 is a prime.

It is a super-2 number, since 2×331979977² = 220421410257841058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331979917) 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, 23712849 + ... + 23712862.

It is an arithmetic number, because the mean of its divisors is an integer number (94851424).

Almost surely, 2^331979977 is an apocalyptic number.

It is an amenable number.

331979977 is a deficient number, since it is larger than the sum of its proper divisors (47425719).

331979977 is an equidigital number, since it uses as much as digits as its factorization.

331979977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47425718.

The product of its digits is 2250423, while the sum is 55.

The square root of 331979977 is about 18220.3176975595. The cubic root of 331979977 is about 692.4216366644.

The spelling of 331979977 in words is "three hundred thirty-one million, nine hundred seventy-nine thousand, nine hundred seventy-seven".