19081969 has 2 divisors, whose sum is σ = 19081970. Its totient is φ = 19081968.

The previous prime is 19081963. The next prime is 19081987. The reversal of 19081969 is 96918091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13417569 + 5664400 = 3663^2 + 2380^2 .

It is a cyclic number.

It is not a de Polignac number, because 19081969 - 2⁹ = 19081457 is a prime.

It is a super-2 number, since 2×19081969² = 728243081833922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19081963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9540984 + 9540985.

It is an arithmetic number, because the mean of its divisors is an integer number (9540985).

Almost surely, 2^19081969 is an apocalyptic number.

It is an amenable number.

19081969 is a deficient number, since it is larger than the sum of its proper divisors (1).

19081969 is an equidigital number, since it uses as much as digits as its factorization.

19081969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 19081969 is about 4368.2913135458. The cubic root of 19081969 is about 267.2233445681.

The spelling of 19081969 in words is "nineteen million, eighty-one thousand, nine hundred sixty-nine".