19691129 has 2 divisors, whose sum is σ = 19691130. Its totient is φ = 19691128.

The previous prime is 19691053. The next prime is 19691149. The reversal of 19691129 is 92119691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19669225 + 21904 = 4435^2 + 148^2 .

It is an emirp because it is prime and its reverse (92119691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19691129 - 2²⁴ = 2913913 is a prime.

It is a super-2 number, since 2×19691129² = 775481122589282, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 19691092 and 19691101.

It is not a weakly prime, because it can be changed into another prime (19691149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9845564 + 9845565.

It is an arithmetic number, because the mean of its divisors is an integer number (9845565).

Almost surely, 2^19691129 is an apocalyptic number.

It is an amenable number.

19691129 is a deficient number, since it is larger than the sum of its proper divisors (1).

19691129 is an equidigital number, since it uses as much as digits as its factorization.

19691129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 38.

The square root of 19691129 is about 4437.4687604534. The cubic root of 19691129 is about 270.0371645230.

The spelling of 19691129 in words is "nineteen million, six hundred ninety-one thousand, one hundred twenty-nine".