31897071 has 40 divisors (see below), whose sum is σ = 50761920. Its totient is φ = 19922112.

The previous prime is 31897069. The next prime is 31897079. The reversal of 31897071 is 17079813.

It is not a de Polignac number, because 31897071 - 2¹ = 31897069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31897079) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 86730 + ... + 87096.

It is an arithmetic number, because the mean of its divisors is an integer number (1269048).

Almost surely, 2^31897071 is an apocalyptic number.

31897071 is a deficient number, since it is larger than the sum of its proper divisors (18864849).

31897071 is a wasteful number, since it uses less digits than its factorization.

31897071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445 (or 436 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The square root of 31897071 is about 5647.7491976893. The cubic root of 31897071 is about 317.1394497703.

The spelling of 31897071 in words is "thirty-one million, eight hundred ninety-seven thousand, seventy-one".