31988907623 has 4 divisors (see below), whose sum is σ = 33672534360. Its totient is φ = 30305280888.

The previous prime is 31988907593. The next prime is 31988907673. The reversal of 31988907623 is 32670988913.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32670988913 = 2129 ⋅15345697.

It is a cyclic number.

It is not a de Polignac number, because 31988907623 - 2¹⁴ = 31988891239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31988907673) 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, 841813340 + ... + 841813377.

It is an arithmetic number, because the mean of its divisors is an integer number (8418133590).

Almost surely, 2^31988907623 is an apocalyptic number.

31988907623 is a deficient number, since it is larger than the sum of its proper divisors (1683626737).

31988907623 is a wasteful number, since it uses less digits than its factorization.

31988907623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1683626736.

The product of its (nonzero) digits is 3919104, while the sum is 56.

The spelling of 31988907623 in words is "thirty-one billion, nine hundred eighty-eight million, nine hundred seven thousand, six hundred twenty-three".