31123401567 has 4 divisors (see below), whose sum is σ = 41497868760. Its totient is φ = 20748934376.

The previous prime is 31123401563. The next prime is 31123401583. The reversal of 31123401567 is 76510432113.

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

It is a cyclic number.

It is not a de Polignac number, because 31123401567 - 2² = 31123401563 is a prime.

It is a super-2 number, since 2×31123401567² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123401563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5187233592 + ... + 5187233597.

It is an arithmetic number, because the mean of its divisors is an integer number (10374467190).

Almost surely, 2^31123401567 is an apocalyptic number.

31123401567 is a deficient number, since it is larger than the sum of its proper divisors (10374467193).

31123401567 is a wasteful number, since it uses less digits than its factorization.

31123401567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10374467192.

The product of its (nonzero) digits is 15120, while the sum is 33.

The spelling of 31123401567 in words is "thirty-one billion, one hundred twenty-three million, four hundred one thousand, five hundred sixty-seven".