31551121241 has 4 divisors (see below), whose sum is σ = 31565139984. Its totient is φ = 31537102500.

The previous prime is 31551121237. The next prime is 31551121307. The reversal of 31551121241 is 14212115513.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31551121241 - 2² = 31551121237 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31551121241.

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 in 3 ways as a sum of consecutive naturals, for example, 7005995 + ... + 7010496.

It is an arithmetic number, because the mean of its divisors is an integer number (7891284996).

Almost surely, 2^31551121241 is an apocalyptic number.

It is an amenable number.

31551121241 is a deficient number, since it is larger than the sum of its proper divisors (14018743).

31551121241 is a wasteful number, since it uses less digits than its factorization.

31551121241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14018742.

The product of its digits is 1200, while the sum is 26.

Adding to 31551121241 its reverse (14212115513), we get a palindrome (45763236754).

The spelling of 31551121241 in words is "thirty-one billion, five hundred fifty-one million, one hundred twenty-one thousand, two hundred forty-one".