31197697 has 4 divisors (see below), whose sum is σ = 32040916. Its totient is φ = 30354480.

The previous prime is 31197689. The next prime is 31197709. The reversal of 31197697 is 79679113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79679113 = 41 ⋅1943393.

It can be written as a sum of positive squares in 2 ways, for example, as 28344976 + 2852721 = 5324^2 + 1689^2 .

It is a cyclic number.

It is not a de Polignac number, because 31197697 - 2³ = 31197689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31197097) 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, 421554 + ... + 421627.

It is an arithmetic number, because the mean of its divisors is an integer number (8010229).

Almost surely, 2^31197697 is an apocalyptic number.

31197697 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

31197697 is a deficient number, since it is larger than the sum of its proper divisors (843219).

31197697 is an equidigital number, since it uses as much as digits as its factorization.

31197697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843218.

The product of its digits is 71442, while the sum is 43.

The square root of 31197697 is about 5585.4898621338. The cubic root of 31197697 is about 314.8044372761.

It can be divided in two parts, 3119 and 7697, that added together give a square (10816 = 104²).

The spelling of 31197697 in words is "thirty-one million, one hundred ninety-seven thousand, six hundred ninety-seven".