1491500999 has 2 divisors, whose sum is σ = 1491501000. Its totient is φ = 1491500998.

The previous prime is 1491500981. The next prime is 1491501013. The reversal of 1491500999 is 9990051941.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1491500999 - 2⁸ = 1491500743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1491500939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745750499 + 745750500.

It is an arithmetic number, because the mean of its divisors is an integer number (745750500).

Almost surely, 2^1491500999 is an apocalyptic number.

1491500999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491500999 is an equidigital number, since it uses as much as digits as its factorization.

1491500999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131220, while the sum is 47.

The square root of 1491500999 is about 38619.9559683850. The cubic root of 1491500999 is about 1142.5481624968.

The spelling of 1491500999 in words is "one billion, four hundred ninety-one million, five hundred thousand, nine hundred ninety-nine".