19791413 has 2 divisors, whose sum is σ = 19791414. Its totient is φ = 19791412.

The previous prime is 19791391. The next prime is 19791439. The reversal of 19791413 is 31419791.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19562929 + 228484 = 4423^2 + 478^2 .

It is a cyclic number.

It is not a de Polignac number, because 19791413 - 2¹⁶ = 19725877 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19791613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9895706 + 9895707.

It is an arithmetic number, because the mean of its divisors is an integer number (9895707).

Almost surely, 2^19791413 is an apocalyptic number.

It is an amenable number.

19791413 is a deficient number, since it is larger than the sum of its proper divisors (1).

19791413 is an equidigital number, since it uses as much as digits as its factorization.

19791413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 35.

The square root of 19791413 is about 4448.7540952496. The cubic root of 19791413 is about 270.4948082412.

The spelling of 19791413 in words is "nineteen million, seven hundred ninety-one thousand, four hundred thirteen".