157643999 has 2 divisors, whose sum is σ = 157644000. Its totient is φ = 157643998.

The previous prime is 157643987. The next prime is 157644037. The reversal of 157643999 is 999346751.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 157643999 - 2⁸ = 157643743 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 157643999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157640999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78821999 + 78822000.

It is an arithmetic number, because the mean of its divisors is an integer number (78822000).

Almost surely, 2^157643999 is an apocalyptic number.

157643999 is a deficient number, since it is larger than the sum of its proper divisors (1).

157643999 is an equidigital number, since it uses as much as digits as its factorization.

157643999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1837080, while the sum is 53.

The square root of 157643999 is about 12555.6361447758. The cubic root of 157643999 is about 540.2056818212.

The spelling of 157643999 in words is "one hundred fifty-seven million, six hundred forty-three thousand, nine hundred ninety-nine".