31190172 has 96 divisors (see below), whose sum is σ = 87494400. Its totient is φ = 8543232.

The previous prime is 31190161. The next prime is 31190197. The reversal of 31190172 is 27109113.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50079 + ... + 50697.

It is an arithmetic number, because the mean of its divisors is an integer number (911400).

Almost surely, 2^31190172 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 31190172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43747200).

31190172 is an abundant number, since it is smaller than the sum of its proper divisors (56304228).

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

31190172 is a wasteful number, since it uses less digits than its factorization.

31190172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675 (or 673 counting only the distinct ones).

The product of its (nonzero) digits is 378, while the sum is 24.

The square root of 31190172 is about 5584.8162010938. The cubic root of 31190172 is about 314.7791245756.

Adding to 31190172 its reverse (27109113), we get a palindrome (58299285).

The spelling of 31190172 in words is "thirty-one million, one hundred ninety thousand, one hundred seventy-two".