31357130 has 32 divisors (see below), whose sum is σ = 66254976. Its totient is φ = 10459584.

The previous prime is 31357121. The next prime is 31357141. The reversal of 31357130 is 3175313.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31357096 and 31357105.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3464 + ... + 8643.

It is an arithmetic number, because the mean of its divisors is an integer number (2070468).

Almost surely, 2^31357130 is an apocalyptic number.

31357130 is an abundant number, since it is smaller than the sum of its proper divisors (34897846).

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

31357130 is a wasteful number, since it uses less digits than its factorization.

31357130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12158.

The product of its (nonzero) digits is 945, while the sum is 23.

The square root of 31357130 is about 5599.7437441369. The cubic root of 31357130 is about 315.3397861967.

The spelling of 31357130 in words is "thirty-one million, three hundred fifty-seven thousand, one hundred thirty".