31431297 has 16 divisors (see below), whose sum is σ = 43852032. Its totient is φ = 20004480.

The previous prime is 31431277. The next prime is 31431299. The reversal of 31431297 is 79213413.

It is not a de Polignac number, because 31431297 - 2⁶ = 31431233 is a prime.

It is a super-2 number, since 2×31431297² = 1975852862204418, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31431299) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3063 + ... + 8499.

It is an arithmetic number, because the mean of its divisors is an integer number (2740752).

Almost surely, 2^31431297 is an apocalyptic number.

It is an amenable number.

31431297 is a deficient number, since it is larger than the sum of its proper divisors (12420735).

31431297 is a wasteful number, since it uses less digits than its factorization.

31431297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5528.

The product of its digits is 4536, while the sum is 30.

The square root of 31431297 is about 5606.3621895129. The cubic root of 31431297 is about 315.5882080697.

The spelling of 31431297 in words is "thirty-one million, four hundred thirty-one thousand, two hundred ninety-seven".