31530401 has 32 divisors (see below), whose sum is σ = 39690240. Its totient is φ = 24463296.

The previous prime is 31530391. The next prime is 31530409. The reversal of 31530401 is 10403513.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31530401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31530401.

It is not an unprimeable number, because it can be changed into a prime (31530409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 399080 + ... + 399158.

It is an arithmetic number, because the mean of its divisors is an integer number (1240320).

Almost surely, 2^31530401 is an apocalyptic number.

It is an amenable number.

31530401 is a deficient number, since it is larger than the sum of its proper divisors (8159839).

31530401 is a wasteful number, since it uses less digits than its factorization.

31530401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 31530401 is about 5615.1937633531. The cubic root of 31530401 is about 315.9195470291.

Adding to 31530401 its reverse (10403513), we get a palindrome (41933914).

The spelling of 31530401 in words is "thirty-one million, five hundred thirty thousand, four hundred one".