31401136 has 20 divisors (see below), whose sum is σ = 65520112. Its totient is φ = 14492736.

The previous prime is 31401133. The next prime is 31401151. The reversal of 31401136 is 63110413.

It is not an unprimeable number, because it can be changed into a prime (31401133) 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 3 ways as a sum of consecutive naturals, for example, 75276 + ... + 75691.

Almost surely, 2^31401136 is an apocalyptic number.

It is an amenable number.

31401136 is an abundant number, since it is smaller than the sum of its proper divisors (34118976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31401136 is a wasteful number, since it uses less digits than its factorization.

31401136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150988 (or 150982 counting only the distinct ones).

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

The square root of 31401136 is about 5603.6716534786. The cubic root of 31401136 is about 315.4872311977.

Adding to 31401136 its reverse (63110413), we get a palindrome (94511549).

The spelling of 31401136 in words is "thirty-one million, four hundred one thousand, one hundred thirty-six".