31230129 has 32 divisors (see below), whose sum is σ = 51840000. Its totient is φ = 16317504.

The previous prime is 31230079. The next prime is 31230163. The reversal of 31230129 is 92103213.

It is a happy number.

It is not a de Polignac number, because 31230129 - 2¹¹ = 31228081 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31230179) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10222 + ... + 12920.

It is an arithmetic number, because the mean of its divisors is an integer number (1620000).

Almost surely, 2^31230129 is an apocalyptic number.

It is an amenable number.

31230129 is a deficient number, since it is larger than the sum of its proper divisors (20609871).

31230129 is a wasteful number, since it uses less digits than its factorization.

31230129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2757.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 31230129 is about 5588.3923448520. The cubic root of 31230129 is about 314.9134859415.

The spelling of 31230129 in words is "thirty-one million, two hundred thirty thousand, one hundred twenty-nine".