31123120230 has 48 divisors (see below), whose sum is σ = 81175455504. Its totient is φ = 8273309760.

The previous prime is 31123120201. The next prime is 31123120241. The reversal of 31123120230 is 3202132113.

31123120230 is a `hidden beast` number, since 311 + 2 + 3 + 120 + 230 = 666.

It is a super-2 number, since 2×31123120230² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 516916 + ... + 573975.

It is an arithmetic number, because the mean of its divisors is an integer number (1691155323).

Almost surely, 2^31123120230 is an apocalyptic number.

31123120230 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31123120230 is an abundant number, since it is smaller than the sum of its proper divisors (50052335274).

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

31123120230 is a wasteful number, since it uses less digits than its factorization.

31123120230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091221 (or 1091218 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31123120230 its reverse (3202132113), we get a palindrome (34325252343).

The spelling of 31123120230 in words is "thirty-one billion, one hundred twenty-three million, one hundred twenty thousand, two hundred thirty".