331889401 has 2 divisors, whose sum is σ = 331889402. Its totient is φ = 331889400.

The previous prime is 331889387. The next prime is 331889443. The reversal of 331889401 is 104988133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 289000000 + 42889401 = 17000^2 + 6549^2 .

It is a cyclic number.

It is not a de Polignac number, because 331889401 - 2¹⁵ = 331856633 is a prime.

It is a super-2 number, since 2×331889401² = 220301148992277602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (331889461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165944700 + 165944701.

It is an arithmetic number, because the mean of its divisors is an integer number (165944701).

Almost surely, 2^331889401 is an apocalyptic number.

It is an amenable number.

331889401 is a deficient number, since it is larger than the sum of its proper divisors (1).

331889401 is an equidigital number, since it uses as much as digits as its factorization.

331889401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 331889401 is about 18217.8319511406. The cubic root of 331889401 is about 692.3586584818.

The spelling of 331889401 in words is "three hundred thirty-one million, eight hundred eighty-nine thousand, four hundred one".