157201691 has 2 divisors, whose sum is σ = 157201692. Its totient is φ = 157201690.

The previous prime is 157201673. The next prime is 157201741. The reversal of 157201691 is 196102751.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157201691 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (157201621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78600845 + 78600846.

It is an arithmetic number, because the mean of its divisors is an integer number (78600846).

Almost surely, 2^157201691 is an apocalyptic number.

157201691 is a deficient number, since it is larger than the sum of its proper divisors (1).

157201691 is an equidigital number, since it uses as much as digits as its factorization.

157201691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 32.

The square root of 157201691 is about 12538.0098500520. The cubic root of 157201691 is about 539.6999830939.

The spelling of 157201691 in words is "one hundred fifty-seven million, two hundred one thousand, six hundred ninety-one".