157788101 has 8 divisors (see below), whose sum is σ = 172831320. Its totient is φ = 143385088.

The previous prime is 157788097. The next prime is 157788133. The reversal of 157788101 is 101887751.

It can be written as a sum of positive squares in 4 ways, for example, as 53217025 + 104571076 = 7295^2 + 10226^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 157788101 - 2² = 157788097 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 (157788161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159536 + ... + 160521.

It is an arithmetic number, because the mean of its divisors is an integer number (21603915).

Almost surely, 2^157788101 is an apocalyptic number.

It is an amenable number.

157788101 is a deficient number, since it is larger than the sum of its proper divisors (15043219).

157788101 is a wasteful number, since it uses less digits than its factorization.

157788101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320103.

The product of its (nonzero) digits is 15680, while the sum is 38.

The square root of 157788101 is about 12561.3733723666. The cubic root of 157788101 is about 540.3702319309.

The spelling of 157788101 in words is "one hundred fifty-seven million, seven hundred eighty-eight thousand, one hundred one".