31425157 has 4 divisors (see below), whose sum is σ = 31485996. Its totient is φ = 31364320.

The previous prime is 31425133. The next prime is 31425179. The reversal of 31425157 is 75152413.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3218436 + 28206721 = 1794^2 + 5311^2 .

It is a cyclic number.

It is not a de Polignac number, because 31425157 - 2⁷ = 31425029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31425127) 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 3 ways as a sum of consecutive naturals, for example, 29638 + ... + 30679.

It is an arithmetic number, because the mean of its divisors is an integer number (7871499).

Almost surely, 2^31425157 is an apocalyptic number.

It is an amenable number.

31425157 is a deficient number, since it is larger than the sum of its proper divisors (60839).

31425157 is an equidigital number, since it uses as much as digits as its factorization.

31425157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60838.

The product of its digits is 4200, while the sum is 28.

The square root of 31425157 is about 5605.8145706043. The cubic root of 31425157 is about 315.5676570269.

The spelling of 31425157 in words is "thirty-one million, four hundred twenty-five thousand, one hundred fifty-seven".