157781207 has 2 divisors, whose sum is σ = 157781208. Its totient is φ = 157781206.

The previous prime is 157781189. The next prime is 157781213. The reversal of 157781207 is 702187751.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 157781207 - 2⁸ = 157780951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157781707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78890603 + 78890604.

It is an arithmetic number, because the mean of its divisors is an integer number (78890604).

Almost surely, 2^157781207 is an apocalyptic number.

157781207 is a deficient number, since it is larger than the sum of its proper divisors (1).

157781207 is an equidigital number, since it uses as much as digits as its factorization.

157781207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27440, while the sum is 38.

The square root of 157781207 is about 12561.0989566996. The cubic root of 157781207 is about 540.3623619529.

The spelling of 157781207 in words is "one hundred fifty-seven million, seven hundred eighty-one thousand, two hundred seven".