157247187 has 4 divisors (see below), whose sum is σ = 209662920. Its totient is φ = 104831456.

The previous prime is 157247171. The next prime is 157247197. The reversal of 157247187 is 781742751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 781742751 = 3 ⋅260580917.

It is a cyclic number.

It is not a de Polignac number, because 157247187 - 2⁴ = 157247171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (157247107) 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, 26207862 + ... + 26207867.

It is an arithmetic number, because the mean of its divisors is an integer number (52415730).

Almost surely, 2^157247187 is an apocalyptic number.

157247187 is a deficient number, since it is larger than the sum of its proper divisors (52415733).

157247187 is an equidigital number, since it uses as much as digits as its factorization.

157247187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52415732.

The product of its digits is 109760, while the sum is 42.

The square root of 157247187 is about 12539.8240418277. The cubic root of 157247187 is about 539.7520432253.

The spelling of 157247187 in words is "one hundred fifty-seven million, two hundred forty-seven thousand, one hundred eighty-seven".