31216232051 has 8 divisors (see below), whose sum is σ = 31526530560. Its totient is φ = 30907158408.

The previous prime is 31216232029. The next prime is 31216232057. The reversal of 31216232051 is 15023261213.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31216232051 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 31216232051.

It is not an unprimeable number, because it can be changed into a prime (31216232057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254951 + ... + 356976.

It is an arithmetic number, because the mean of its divisors is an integer number (3940816320).

Almost surely, 2^31216232051 is an apocalyptic number.

31216232051 is a deficient number, since it is larger than the sum of its proper divisors (310298509).

31216232051 is a wasteful number, since it uses less digits than its factorization.

31216232051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612433.

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 31216232051 its reverse (15023261213), we get a palindrome (46239493264).

The spelling of 31216232051 in words is "thirty-one billion, two hundred sixteen million, two hundred thirty-two thousand, fifty-one".