31387401 has 6 divisors (see below), whose sum is σ = 45337370. Its totient is φ = 20924928.

The previous prime is 31387393. The next prime is 31387409. The reversal of 31387401 is 10478313.

It is an interprime number because it is at equal distance from previous prime (31387393) and next prime (31387409).

It can be written as a sum of positive squares in only one way, i.e., 31136400 + 251001 = 5580^2 + 501^2 .

It is not a de Polignac number, because 31387401 - 2³ = 31387393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31387409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1743736 + ... + 1743753.

Almost surely, 2^31387401 is an apocalyptic number.

It is an amenable number.

31387401 is a deficient number, since it is larger than the sum of its proper divisors (13949969).

31387401 is a wasteful number, since it uses less digits than its factorization.

31387401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3487495 (or 3487492 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 31387401 is about 5602.4459836753. The cubic root of 31387401 is about 315.4412259718.

The spelling of 31387401 in words is "thirty-one million, three hundred eighty-seven thousand, four hundred one".