31397269 has 8 divisors (see below), whose sum is σ = 32237568. Its totient is φ = 30564240.

The previous prime is 31397243. The next prime is 31397273. The reversal of 31397269 is 96279313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31397269 - 2¹⁹ = 30872981 is a prime.

It is a super-2 number, since 2×31397269² = 1971577001316722, 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 (31397209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7564 + ... + 10954.

It is an arithmetic number, because the mean of its divisors is an integer number (4029696).

Almost surely, 2^31397269 is an apocalyptic number.

It is an amenable number.

31397269 is a deficient number, since it is larger than the sum of its proper divisors (840299).

31397269 is a wasteful number, since it uses less digits than its factorization.

31397269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3635.

The product of its digits is 61236, while the sum is 40.

The square root of 31397269 is about 5603.3266012254. The cubic root of 31397269 is about 315.4742800823.

The spelling of 31397269 in words is "thirty-one million, three hundred ninety-seven thousand, two hundred sixty-nine".