1642457099 has 2 divisors, whose sum is σ = 1642457100. Its totient is φ = 1642457098.

The previous prime is 1642457093. The next prime is 1642457107. The reversal of 1642457099 is 9907542461.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1642457099 is a prime.

It is not a weakly prime, because it can be changed into another prime (1642457093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821228549 + 821228550.

It is an arithmetic number, because the mean of its divisors is an integer number (821228550).

Almost surely, 2^1642457099 is an apocalyptic number.

1642457099 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642457099 is an equidigital number, since it uses as much as digits as its factorization.

1642457099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 47.

The square root of 1642457099 is about 40527.2389757802. The cubic root of 1642457099 is about 1179.8623556291.

The spelling of 1642457099 in words is "one billion, six hundred forty-two million, four hundred fifty-seven thousand, ninety-nine".