19129983961 has 6 divisors (see below), whose sum is σ = 21027172586. Its totient is φ = 17390894400.

The previous prime is 19129983949. The next prime is 19129983989. The reversal of 19129983961 is 16938992191.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12330992025 + 6798991936 = 111045^2 + 82456^2 .

It is not a de Polignac number, because 19129983961 - 2⁷ = 19129983833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19129983896 and 19129983905.

It is not an unprimeable number, because it can be changed into a prime (19129983911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 79049400 + ... + 79049641.

Almost surely, 2^19129983961 is an apocalyptic number.

19129983961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19129983961 is a deficient number, since it is larger than the sum of its proper divisors (1897188625).

19129983961 is a wasteful number, since it uses less digits than its factorization.

19129983961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158099063 (or 158099052 counting only the distinct ones).

The product of its digits is 1889568, while the sum is 58.

The spelling of 19129983961 in words is "nineteen billion, one hundred twenty-nine million, nine hundred eighty-three thousand, nine hundred sixty-one".