31413391 has 4 divisors (see below), whose sum is σ = 31442632. Its totient is φ = 31384152.

The previous prime is 31413383. The next prime is 31413397. The reversal of 31413391 is 19331413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19331413 = 197 ⋅98129.

It is a cyclic number.

It is not a de Polignac number, because 31413391 - 2³ = 31413383 is a prime.

It is a super-2 number, since 2×31413391² = 1973602268237762, 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 (31413397) 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, 12945 + ... + 15178.

It is an arithmetic number, because the mean of its divisors is an integer number (7860658).

Almost surely, 2^31413391 is an apocalyptic number.

31413391 is a deficient number, since it is larger than the sum of its proper divisors (29241).

31413391 is a wasteful number, since it uses less digits than its factorization.

31413391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29240.

The product of its digits is 972, while the sum is 25.

The square root of 31413391 is about 5604.7650262968. The cubic root of 31413391 is about 315.5282678570.

The spelling of 31413391 in words is "thirty-one million, four hundred thirteen thousand, three hundred ninety-one".