157701391 has 4 divisors (see below), whose sum is σ = 163139400. Its totient is φ = 152263384.

The previous prime is 157701377. The next prime is 157701431. The reversal of 157701391 is 193107751.

157701391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 157701391 - 2¹¹ = 157699343 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 (157701191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2718961 + ... + 2719018.

It is an arithmetic number, because the mean of its divisors is an integer number (40784850).

Almost surely, 2^157701391 is an apocalyptic number.

157701391 is a deficient number, since it is larger than the sum of its proper divisors (5438009).

157701391 is an equidigital number, since it uses as much as digits as its factorization.

157701391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5438008.

The product of its (nonzero) digits is 6615, while the sum is 34.

The square root of 157701391 is about 12557.9214442518. The cubic root of 157701391 is about 540.2712297711.

It can be divided in two parts, 15770 and 1391, that added together give a square (17161 = 131²).

The spelling of 157701391 in words is "one hundred fifty-seven million, seven hundred one thousand, three hundred ninety-one".