157561771 has 2 divisors, whose sum is σ = 157561772. Its totient is φ = 157561770.

The previous prime is 157561769. The next prime is 157561777. The reversal of 157561771 is 177165751.

It is a happy number.

157561771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 157561771 - 2¹ = 157561769 is a prime.

Together with 157561769, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (157561777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78780885 + 78780886.

It is an arithmetic number, because the mean of its divisors is an integer number (78780886).

Almost surely, 2^157561771 is an apocalyptic number.

157561771 is a deficient number, since it is larger than the sum of its proper divisors (1).

157561771 is an equidigital number, since it uses as much as digits as its factorization.

157561771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51450, while the sum is 40.

The square root of 157561771 is about 12552.3611723054. The cubic root of 157561771 is about 540.1117407079. Note that the first 3 decimals are identical.

The spelling of 157561771 in words is "one hundred fifty-seven million, five hundred sixty-one thousand, seven hundred seventy-one".