31130401 has 4 divisors (see below), whose sum is σ = 31144212. Its totient is φ = 31116592.

The previous prime is 31130399. The next prime is 31130419. The reversal of 31130401 is 10403113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7617600 + 23512801 = 2760^2 + 4849^2 .

It is a cyclic number.

It is not a de Polignac number, because 31130401 - 2¹ = 31130399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31130441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2650 + ... + 8323.

It is an arithmetic number, because the mean of its divisors is an integer number (7786053).

Almost surely, 2^31130401 is an apocalyptic number.

It is an amenable number.

31130401 is a deficient number, since it is larger than the sum of its proper divisors (13811).

31130401 is a wasteful number, since it uses less digits than its factorization.

31130401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13810.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 31130401 is about 5579.4624293027. The cubic root of 31130401 is about 314.5779213002.

Adding to 31130401 its reverse (10403113), we get a palindrome (41533514).

The spelling of 31130401 in words is "thirty-one million, one hundred thirty thousand, four hundred one".