157640999 has 2 divisors, whose sum is σ = 157641000. Its totient is φ = 157640998.

The previous prime is 157640981. The next prime is 157641007. The reversal of 157640999 is 999046751.

157640999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 157640999 - 2¹⁶ = 157575463 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 (157640969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78820499 + 78820500.

It is an arithmetic number, because the mean of its divisors is an integer number (78820500).

Almost surely, 2^157640999 is an apocalyptic number.

157640999 is a deficient number, since it is larger than the sum of its proper divisors (1).

157640999 is an equidigital number, since it uses as much as digits as its factorization.

157640999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 612360, while the sum is 50.

The square root of 157640999 is about 12555.5166759477. The cubic root of 157640999 is about 540.2022550551.

The spelling of 157640999 in words is "one hundred fifty-seven million, six hundred forty thousand, nine hundred ninety-nine".