31143492 has 72 divisors (see below), whose sum is σ = 81996096. Its totient is φ = 9958464.

The previous prime is 31143491. The next prime is 31143493. The reversal of 31143492 is 29434113.

31143492 is a `hidden beast` number, since 31 + 143 + 492 = 666.

It is an interprime number because it is at equal distance from previous prime (31143491) and next prime (31143493).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (31143491) 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 23 ways as a sum of consecutive naturals, for example, 137083 + ... + 137309.

Almost surely, 2^31143492 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31143492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40998048).

31143492 is an abundant number, since it is smaller than the sum of its proper divisors (50852604).

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

31143492 is a wasteful number, since it uses less digits than its factorization.

31143492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377 (or 372 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 31143492 is about 5580.6354476887. The cubic root of 31143492 is about 314.6220107039.

The spelling of 31143492 in words is "thirty-one million, one hundred forty-three thousand, four hundred ninety-two".