31136401 has 16 divisors (see below), whose sum is σ = 34428240. Its totient is φ = 28026880.

The previous prime is 31136393. The next prime is 31136407. The reversal of 31136401 is 10463113.

It is a Cunningham number, because it is equal to 5580²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 389376 + 30747025 = 624^2 + 5545^2 .

It is not a de Polignac number, because 31136401 - 2³ = 31136393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31136407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67311 + ... + 67771.

It is an arithmetic number, because the mean of its divisors is an integer number (2151765).

Almost surely, 2^31136401 is an apocalyptic number.

It is an amenable number.

31136401 is a deficient number, since it is larger than the sum of its proper divisors (3291839).

31136401 is a wasteful number, since it uses less digits than its factorization.

31136401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 31136401 is about 5580.0000896057. Note that the first 4 decimals coincide. The cubic root of 31136401 is about 314.5981303372.

Adding to 31136401 its reverse (10463113), we get a palindrome (41599514).

The spelling of 31136401 in words is "thirty-one million, one hundred thirty-six thousand, four hundred one".