31403601 has 12 divisors (see below), whose sum is σ = 45540612. Its totient is φ = 20852736.

The previous prime is 31403597. The next prime is 31403623. The reversal of 31403601 is 10630413.

It can be written as a sum of positive squares in 2 ways, for example, as 30636225 + 767376 = 5535^2 + 876^2 .

It is not a de Polignac number, because 31403601 - 2² = 31403597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31402601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4476 + ... + 9101.

It is an arithmetic number, because the mean of its divisors is an integer number (3795051).

Almost surely, 2^31403601 is an apocalyptic number.

It is an amenable number.

31403601 is a deficient number, since it is larger than the sum of its proper divisors (14137011).

31403601 is a wasteful number, since it uses less digits than its factorization.

31403601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13840 (or 13837 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 31403601 is about 5603.8915942406. The cubic root of 31403601 is about 315.4954862672.

The spelling of 31403601 in words is "thirty-one million, four hundred three thousand, six hundred one".