31220130 has 16 divisors (see below), whose sum is σ = 74928384. Its totient is φ = 8325360.

The previous prime is 31220093. The next prime is 31220159. The reversal of 31220130 is 3102213.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 520306 + ... + 520365.

It is an arithmetic number, because the mean of its divisors is an integer number (4683024).

Almost surely, 2^31220130 is an apocalyptic number.

31220130 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31220130 is an abundant number, since it is smaller than the sum of its proper divisors (43708254).

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

31220130 is a wasteful number, since it uses less digits than its factorization.

31220130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040681.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 31220130 is about 5587.4976510062. The cubic root of 31220130 is about 314.8798735703.

Adding to 31220130 its reverse (3102213), we get a palindrome (34322343).

The spelling of 31220130 in words is "thirty-one million, two hundred twenty thousand, one hundred thirty".