19898450631 has 24 divisors (see below), whose sum is σ = 30282706160. Its totient is φ = 12904211088.

The previous prime is 19898450629. The next prime is 19898450641. The reversal of 19898450631 is 13605489891.

19898450631 is a `hidden beast` number, since 19 + 8 + 98 + 4 + 506 + 31 = 666.

It is not a de Polignac number, because 19898450631 - 2¹ = 19898450629 is a prime.

It is a super-2 number, since 2×19898450631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19898450641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4456306 + ... + 4460768.

Almost surely, 2^19898450631 is an apocalyptic number.

19898450631 is a deficient number, since it is larger than the sum of its proper divisors (10384255529).

19898450631 is an frugal number, since it uses more digits than its factorization.

19898450631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8972 (or 4503 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 19898450631 in words is "nineteen billion, eight hundred ninety-eight million, four hundred fifty thousand, six hundred thirty-one".