19621087 has 2 divisors, whose sum is σ = 19621088. Its totient is φ = 19621086.

The previous prime is 19621067. The next prime is 19621103. The reversal of 19621087 is 78012691.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19621087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19621027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9810543 + 9810544.

It is an arithmetic number, because the mean of its divisors is an integer number (9810544).

Almost surely, 2^19621087 is an apocalyptic number.

19621087 is a deficient number, since it is larger than the sum of its proper divisors (1).

19621087 is an equidigital number, since it uses as much as digits as its factorization.

19621087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 19621087 is about 4429.5696179200. The cubic root of 19621087 is about 269.7166070892.

The spelling of 19621087 in words is "nineteen million, six hundred twenty-one thousand, eighty-seven".