31968451551 has 8 divisors (see below), whose sum is σ = 43224948864. Its totient is φ = 21012127640.

The previous prime is 31968451549. The next prime is 31968451553. The reversal of 31968451551 is 15515486913.

It is an interprime number because it is at equal distance from previous prime (31968451549) and next prime (31968451553).

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

It is a cyclic number.

It is not a de Polignac number, because 31968451551 - 2¹ = 31968451549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31968451551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31968451553) 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, 75043101 + ... + 75043526.

It is an arithmetic number, because the mean of its divisors is an integer number (5403118608).

Almost surely, 2^31968451551 is an apocalyptic number.

31968451551 is a deficient number, since it is larger than the sum of its proper divisors (11256497313).

31968451551 is a wasteful number, since it uses less digits than its factorization.

31968451551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150086701.

The product of its digits is 648000, while the sum is 48.

The spelling of 31968451551 in words is "thirty-one billion, nine hundred sixty-eight million, four hundred fifty-one thousand, five hundred fifty-one".