393131 has 4 divisors (see below), whose sum is σ = 396264. Its totient is φ = 390000.

The previous prime is 393121. The next prime is 393137. The reversal of 393131 is 131393.

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 393131 - 2¹⁸ = 130987 is a prime.

It is a super-2 number, since 2×393131² = 309103966322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (393137) 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, 1370 + ... + 1631.

It is an arithmetic number, because the mean of its divisors is an integer number (99066).

2³⁹³¹³¹ is an apocalyptic number.

393131 is a deficient number, since it is larger than the sum of its proper divisors (3133).

393131 is a wasteful number, since it uses less digits than its factorization.

393131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3132.

The product of its digits is 243, while the sum is 20.

The square root of 393131 is about 627.0015948943. The cubic root of 393131 is about 73.2564322416.

The spelling of 393131 in words is "three hundred ninety-three thousand, one hundred thirty-one".