312120051500 has 48 divisors (see below), whose sum is σ = 681819386976. Its totient is φ = 124820696000.

The previous prime is 312120051461. The next prime is 312120051533. The reversal of 312120051500 is 5150021213.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 2300555 + ... + 2432445.

It is an arithmetic number, because the mean of its divisors is an integer number (14204570562).

Almost surely, 2^312120051500 is an apocalyptic number.

It is an amenable number.

312120051500 is an abundant number, since it is smaller than the sum of its proper divisors (369699335476).

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

312120051500 is a wasteful number, since it uses less digits than its factorization.

312120051500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136643 (or 136631 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

Adding to 312120051500 its reverse (5150021213), we get a palindrome (317270072713).

The spelling of 312120051500 in words is "three hundred twelve billion, one hundred twenty million, fifty-one thousand, five hundred".