31200130 has 32 divisors (see below), whose sum is σ = 61072704. Its totient is φ = 11407296.

The previous prime is 31200089. The next prime is 31200137. The reversal of 31200130 is 3100213.

It is a super-2 number, since 2×31200130² = 1946896224033800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (31200137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12789 + ... + 15031.

It is an arithmetic number, because the mean of its divisors is an integer number (1908522).

Almost surely, 2^31200130 is an apocalyptic number.

31200130 is a deficient number, since it is larger than the sum of its proper divisors (29872574).

31200130 is a wasteful number, since it uses less digits than its factorization.

31200130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2370.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 31200130 is about 5585.7076543622. The cubic root of 31200130 is about 314.8126205648.

Adding to 31200130 its reverse (3100213), we get a palindrome (34300343).

The spelling of 31200130 in words is "thirty-one million, two hundred thousand, one hundred thirty".