157121078 has 4 divisors (see below), whose sum is σ = 235681620. Its totient is φ = 78560538.

The previous prime is 157121077. The next prime is 157121099. The reversal of 157121078 is 870121751.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157121077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39280268 + ... + 39280271.

It is an arithmetic number, because the mean of its divisors is an integer number (58920405).

Almost surely, 2^157121078 is an apocalyptic number.

157121078 is a deficient number, since it is larger than the sum of its proper divisors (78560542).

157121078 is an equidigital number, since it uses as much as digits as its factorization.

157121078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78560541.

The product of its (nonzero) digits is 3920, while the sum is 32.

The square root of 157121078 is about 12534.7946931731. The cubic root of 157121078 is about 539.6077146343.

The spelling of 157121078 in words is "one hundred fifty-seven million, one hundred twenty-one thousand, seventy-eight".