31355120000 has 80 divisors (see below), whose sum is σ = 78056810700. Its totient is φ = 12542016000.

The previous prime is 31355119979. The next prime is 31355120029. The reversal of 31355120000 is 2155313.

It is a tau number, because it is divible by the number of its divisors (80).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 115970 + ... + 275969.

Almost surely, 2^31355120000 is an apocalyptic number.

It is an amenable number.

31355120000 is an abundant number, since it is smaller than the sum of its proper divisors (46701690700).

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

31355120000 is an frugal number, since it uses more digits than its factorization.

31355120000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391973 (or 391946 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 20.

Adding to 31355120000 its reverse (2155313), we get a palindrome (31357275313).

The spelling of 31355120000 in words is "thirty-one billion, three hundred fifty-five million, one hundred twenty thousand".