31250142 has 72 divisors (see below), whose sum is σ = 85950072. Its totient is φ = 8114400.

The previous prime is 31250137. The next prime is 31250143. The reversal of 31250142 is 24105213.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31250143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8092 + ... + 11312.

It is an arithmetic number, because the mean of its divisors is an integer number (1193751).

Almost surely, 2^31250142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31250142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42975036).

31250142 is an abundant number, since it is smaller than the sum of its proper divisors (54699930).

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

31250142 is a wasteful number, since it uses less digits than its factorization.

31250142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3254 (or 3244 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 31250142 is about 5590.1826446012. The cubic root of 31250142 is about 314.9807395631.

Adding to 31250142 its reverse (24105213), we get a palindrome (55355355).

Subtracting from 31250142 its reverse (24105213), we obtain a square (7144929 = 2673²).

The spelling of 31250142 in words is "thirty-one million, two hundred fifty thousand, one hundred forty-two".