31828897 has 4 divisors (see below), whose sum is σ = 31840276. Its totient is φ = 31817520.

The previous prime is 31828889. The next prime is 31828903. The reversal of 31828897 is 79882813.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 79882813 = 17 ⋅4698989.

It can be written as a sum of positive squares in 2 ways, for example, as 18352656 + 13476241 = 4284^2 + 3671^2 .

It is a cyclic number.

It is not a de Polignac number, because 31828897 - 2³ = 31828889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31828807) 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, 1747 + ... + 8167.

It is an arithmetic number, because the mean of its divisors is an integer number (7960069).

Almost surely, 2^31828897 is an apocalyptic number.

It is an amenable number.

31828897 is a deficient number, since it is larger than the sum of its proper divisors (11379).

31828897 is an equidigital number, since it uses as much as digits as its factorization.

31828897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11378.

The product of its digits is 193536, while the sum is 46.

The square root of 31828897 is about 5641.7104675798. The cubic root of 31828897 is about 316.9133466010.

The spelling of 31828897 in words is "thirty-one million, eight hundred twenty-eight thousand, eight hundred ninety-seven".