31491102 has 16 divisors (see below), whose sum is σ = 65014272. Its totient is φ = 10158360.

The previous prime is 31491101. The next prime is 31491143. The reversal of 31491102 is 20119413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31491101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84468 + ... + 84839.

It is an arithmetic number, because the mean of its divisors is an integer number (4063392).

Almost surely, 2^31491102 is an apocalyptic number.

31491102 is an abundant number, since it is smaller than the sum of its proper divisors (33523170).

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

31491102 is a wasteful number, since it uses less digits than its factorization.

31491102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169343.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 31491102 is about 5611.6933273300. The cubic root of 31491102 is about 315.7882400624.

The spelling of 31491102 in words is "thirty-one million, four hundred ninety-one thousand, one hundred two".