157206191 has 4 divisors (see below), whose sum is σ = 166453632. Its totient is φ = 147958752.

The previous prime is 157206167. The next prime is 157206221. The reversal of 157206191 is 191602751.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 157206191 - 2¹⁴ = 157189807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157206121) 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 in 3 ways as a sum of consecutive naturals, for example, 4623695 + ... + 4623728.

It is an arithmetic number, because the mean of its divisors is an integer number (41613408).

Almost surely, 2^157206191 is an apocalyptic number.

157206191 is a deficient number, since it is larger than the sum of its proper divisors (9247441).

157206191 is an equidigital number, since it uses as much as digits as its factorization.

157206191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9247440.

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

The square root of 157206191 is about 12538.1893030852. The cubic root of 157206191 is about 539.7051327984.

The spelling of 157206191 in words is "one hundred fifty-seven million, two hundred six thousand, one hundred ninety-one".