31897401 has 4 divisors (see below), whose sum is σ = 42529872. Its totient is φ = 21264932.

The previous prime is 31897399. The next prime is 31897403. The reversal of 31897401 is 10479813.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (31897399) and next prime (31897403).

It is a cyclic number.

It is not a de Polignac number, because 31897401 - 2¹ = 31897399 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31897403) 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, 5316231 + ... + 5316236.

It is an arithmetic number, because the mean of its divisors is an integer number (10632468).

Almost surely, 2^31897401 is an apocalyptic number.

It is an amenable number.

31897401 is a deficient number, since it is larger than the sum of its proper divisors (10632471).

31897401 is a wasteful number, since it uses less digits than its factorization.

31897401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10632470.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 31897401 is about 5647.7784127921. The cubic root of 31897401 is about 317.1405434513.

The spelling of 31897401 in words is "thirty-one million, eight hundred ninety-seven thousand, four hundred one".