19909578031 has 8 divisors (see below), whose sum is σ = 23218167200. Its totient is φ = 17065352304.

The previous prime is 19909577993. The next prime is 19909578077. The reversal of 19909578031 is 13087590991.

It is a happy number.

It is not a de Polignac number, because 19909578031 - 2¹⁷ = 19909446959 is a prime.

It is a super-2 number, since 2×19909578031² (a number of 21 digits) contains 22 as substring.

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 19909578031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19909573031) 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, 29022366 + ... + 29023051.

It is an arithmetic number, because the mean of its divisors is an integer number (2902270900).

Almost surely, 2^19909578031 is an apocalyptic number.

19909578031 is a deficient number, since it is larger than the sum of its proper divisors (3308589169).

19909578031 is an frugal number, since it uses more digits than its factorization.

19909578031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58045438 (or 58045424 counting only the distinct ones).

The product of its (nonzero) digits is 612360, while the sum is 52.

The spelling of 19909578031 in words is "nineteen billion, nine hundred nine million, five hundred seventy-eight thousand, thirty-one".