331977953 has 2 divisors, whose sum is σ = 331977954. Its totient is φ = 331977952.

The previous prime is 331977923. The next prime is 331977959. The reversal of 331977953 is 359779133.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 233233984 + 98743969 = 15272^2 + 9937^2 .

It is a cyclic number.

It is not a de Polignac number, because 331977953 - 2¹⁰ = 331976929 is a prime.

It is a super-2 number, since 2×331977953² = 220418722556140418, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 331977898 and 331977907.

It is not a weakly prime, because it can be changed into another prime (331977959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165988976 + 165988977.

It is an arithmetic number, because the mean of its divisors is an integer number (165988977).

Almost surely, 2^331977953 is an apocalyptic number.

It is an amenable number.

331977953 is a deficient number, since it is larger than the sum of its proper divisors (1).

331977953 is an equidigital number, since it uses as much as digits as its factorization.

331977953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 535815, while the sum is 47.

The square root of 331977953 is about 18220.2621550844. The cubic root of 331977953 is about 692.4202294869.

The spelling of 331977953 in words is "three hundred thirty-one million, nine hundred seventy-seven thousand, nine hundred fifty-three".