157851787 has 4 divisors (see below), whose sum is σ = 158203800. Its totient is φ = 157499776.

The previous prime is 157851781. The next prime is 157851821. The reversal of 157851787 is 787158751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 787158751 = 101 ⋅7793651.

It is a cyclic number.

It is not a de Polignac number, because 157851787 - 2¹⁵ = 157819019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 157851787.

It is not an unprimeable number, because it can be changed into a prime (157851781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175333 + ... + 176230.

It is an arithmetic number, because the mean of its divisors is an integer number (39550950).

Almost surely, 2^157851787 is an apocalyptic number.

157851787 is a deficient number, since it is larger than the sum of its proper divisors (352013).

157851787 is an equidigital number, since it uses as much as digits as its factorization.

157851787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352012.

The product of its digits is 548800, while the sum is 49.

The square root of 157851787 is about 12563.9081101383. The cubic root of 157851787 is about 540.4429230683.

The spelling of 157851787 in words is "one hundred fifty-seven million, eight hundred fifty-one thousand, seven hundred eighty-seven".