31312212004154 has 4 divisors (see below), whose sum is σ = 46968318006234. Its totient is φ = 15656106002076.

The previous prime is 31312212004153. The next prime is 31312212004159. The reversal of 31312212004154 is 45140021221313.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 26302999536025 + 5009212468129 = 5128645^2 + 2238127^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31312212004153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7828053001037 + ... + 7828053001040.

Almost surely, 2^{31312212004154} is an apocalyptic number.

31312212004154 is a deficient number, since it is larger than the sum of its proper divisors (15656106002080).

31312212004154 is a wasteful number, since it uses less digits than its factorization.

31312212004154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15656106002079.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 31312212004154 its reverse (45140021221313), we get a palindrome (76452233225467).

The spelling of 31312212004154 in words is "thirty-one trillion, three hundred twelve billion, two hundred twelve million, four thousand, one hundred fifty-four".