331685407 has 4 divisors (see below), whose sum is σ = 331841056. Its totient is φ = 331529760.

The previous prime is 331685381. The next prime is 331685429. The reversal of 331685407 is 704586133.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 331685407 - 2¹⁵ = 331652639 is a prime.

It is a super-2 number, since 2×331685407² = 220030418433511298, 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 (331685437) 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, 74583 + ... + 78904.

It is an arithmetic number, because the mean of its divisors is an integer number (82960264).

Almost surely, 2^331685407 is an apocalyptic number.

331685407 is a deficient number, since it is larger than the sum of its proper divisors (155649).

331685407 is a wasteful number, since it uses less digits than its factorization.

331685407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155648.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 331685407 is about 18212.2323453222. The cubic root of 331685407 is about 692.2167779251.

The spelling of 331685407 in words is "three hundred thirty-one million, six hundred eighty-five thousand, four hundred seven".