19480991 has 2 divisors, whose sum is σ = 19480992. Its totient is φ = 19480990.

The previous prime is 19480973. The next prime is 19481017. The reversal of 19480991 is 19908491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19480991 - 2¹⁸ = 19218847 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19480921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9740495 + 9740496.

It is an arithmetic number, because the mean of its divisors is an integer number (9740496).

Almost surely, 2^19480991 is an apocalyptic number.

19480991 is a deficient number, since it is larger than the sum of its proper divisors (1).

19480991 is an equidigital number, since it uses as much as digits as its factorization.

19480991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 19480991 is about 4413.7275629563. The cubic root of 19480991 is about 269.0731410680.

The spelling of 19480991 in words is "nineteen million, four hundred eighty thousand, nine hundred ninety-one".