19691051 has 2 divisors, whose sum is σ = 19691052. Its totient is φ = 19691050.

The previous prime is 19691017. The next prime is 19691053. The reversal of 19691051 is 15019691.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (15019691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19691051 - 2¹⁴ = 19674667 is a prime.

It is a Sophie Germain prime.

Together with 19691053, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 19690999 and 19691017.

It is not a weakly prime, because it can be changed into another prime (19691053) 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 as a sum of consecutive naturals, namely, 9845525 + 9845526.

It is an arithmetic number, because the mean of its divisors is an integer number (9845526).

Almost surely, 2^19691051 is an apocalyptic number.

19691051 is a deficient number, since it is larger than the sum of its proper divisors (1).

19691051 is an equidigital number, since it uses as much as digits as its factorization.

19691051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430, while the sum is 32.

The square root of 19691051 is about 4437.4599716504. The cubic root of 19691051 is about 270.0368079677.

The spelling of 19691051 in words is "nineteen million, six hundred ninety-one thousand, fifty-one".