31405401 has 10 divisors (see below), whose sum is σ = 46914362. Its totient is φ = 20936880.

The previous prime is 31405369. The next prime is 31405411. The reversal of 31405401 is 10450413.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 30239001 + 1166400 = 5499^2 + 1080^2 .

It is not a de Polignac number, because 31405401 - 2⁵ = 31405369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31405411) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 193780 + ... + 193941.

Almost surely, 2^31405401 is an apocalyptic number.

It is an amenable number.

31405401 is a deficient number, since it is larger than the sum of its proper divisors (15508961).

31405401 is an equidigital number, since it uses as much as digits as its factorization.

31405401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387733 (or 387724 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 31405401 is about 5604.0521946177. The cubic root of 31405401 is about 315.5015140369.

Adding to 31405401 its reverse (10450413), we get a palindrome (41855814).

The spelling of 31405401 in words is "thirty-one million, four hundred five thousand, four hundred one".