31489136 has 20 divisors (see below), whose sum is σ = 69726192. Its totient is φ = 13495296.

The previous prime is 31489097. The next prime is 31489147. The reversal of 31489136 is 63198413.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 31489096 and 31489105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140465 + ... + 140688.

Almost surely, 2^31489136 is an apocalyptic number.

It is an amenable number.

31489136 is an abundant number, since it is smaller than the sum of its proper divisors (38237056).

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

31489136 is a wasteful number, since it uses less digits than its factorization.

31489136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281168 (or 281162 counting only the distinct ones).

The product of its digits is 15552, while the sum is 35.

The square root of 31489136 is about 5611.5181546530. The cubic root of 31489136 is about 315.7816683373.

The spelling of 31489136 in words is "thirty-one million, four hundred eighty-nine thousand, one hundred thirty-six".