331778461 has 12 divisors (see below), whose sum is σ = 398398080. Its totient is φ = 275206680.

The previous prime is 331778441. The next prime is 331778467. The reversal of 331778461 is 164877133.

It is not a de Polignac number, because 331778461 - 2⁹ = 331777949 is a prime.

It is a super-2 number, since 2×331778461² = 220153894367057042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331778467) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107691 + ... + 110728.

It is an arithmetic number, because the mean of its divisors is an integer number (33199840).

Almost surely, 2^331778461 is an apocalyptic number.

331778461 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

331778461 is a deficient number, since it is larger than the sum of its proper divisors (66619619).

331778461 is a wasteful number, since it uses less digits than its factorization.

331778461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218464 (or 218457 counting only the distinct ones).

The product of its digits is 84672, while the sum is 40.

The square root of 331778461 is about 18214.7868776991. The cubic root of 331778461 is about 692.2815054409.

The spelling of 331778461 in words is "three hundred thirty-one million, seven hundred seventy-eight thousand, four hundred sixty-one".