157798111 has 4 divisors (see below), whose sum is σ = 158158000. Its totient is φ = 157438224.

The previous prime is 157798099. The next prime is 157798127. The reversal of 157798111 is 111897751.

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

It is a cyclic number.

It is not a de Polignac number, because 157798111 - 2¹⁵ = 157765343 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 (157792111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179286 + ... + 180163.

It is an arithmetic number, because the mean of its divisors is an integer number (39539500).

Almost surely, 2^157798111 is an apocalyptic number.

157798111 is a deficient number, since it is larger than the sum of its proper divisors (359889).

157798111 is an equidigital number, since it uses as much as digits as its factorization.

157798111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359888.

The product of its digits is 17640, while the sum is 40.

The square root of 157798111 is about 12561.7718097409. The cubic root of 157798111 is about 540.3816586304.

The spelling of 157798111 in words is "one hundred fifty-seven million, seven hundred ninety-eight thousand, one hundred eleven".