19945217031 has 32 divisors (see below), whose sum is σ = 27331584000. Its totient is φ = 12933406080.

The previous prime is 19945217029. The next prime is 19945217041. The reversal of 19945217031 is 13071254991.

It is not a de Polignac number, because 19945217031 - 2¹ = 19945217029 is a prime.

It is a super-2 number, since 2×19945217031² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19945217011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8109880 + ... + 8112338.

It is an arithmetic number, because the mean of its divisors is an integer number (854112000).

Almost surely, 2^19945217031 is an apocalyptic number.

19945217031 is a deficient number, since it is larger than the sum of its proper divisors (7386366969).

19945217031 is a wasteful number, since it uses less digits than its factorization.

19945217031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2999.

The product of its (nonzero) digits is 68040, while the sum is 42.

The spelling of 19945217031 in words is "nineteen billion, nine hundred forty-five million, two hundred seventeen thousand, thirty-one".