31551121204 has 6 divisors (see below), whose sum is σ = 55214462114. Its totient is φ = 15775560600.

The previous prime is 31551121201. The next prime is 31551121211. The reversal of 31551121204 is 40212115513.

It can be written as a sum of positive squares in only one way, i.e., 29772812304 + 1778308900 = 172548^2 + 42170^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31551121201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3943890147 + ... + 3943890154.

Almost surely, 2^31551121204 is an apocalyptic number.

It is an amenable number.

31551121204 is a deficient number, since it is larger than the sum of its proper divisors (23663340910).

31551121204 is a wasteful number, since it uses less digits than its factorization.

31551121204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7887780305 (or 7887780303 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 31551121204 its reverse (40212115513), we get a palindrome (71763236717).

The spelling of 31551121204 in words is "thirty-one billion, five hundred fifty-one million, one hundred twenty-one thousand, two hundred four".