161786157 has 32 divisors (see below), whose sum is σ = 244944000. Its totient is φ = 94278912.

The previous prime is 161786129. The next prime is 161786227. The reversal of 161786157 is 751687161.

It is a happy number.

It is not a de Polignac number, because 161786157 - 2⁷ = 161786029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161786057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58594 + ... + 61292.

It is an arithmetic number, because the mean of its divisors is an integer number (7654500).

Almost surely, 2^161786157 is an apocalyptic number.

It is an amenable number.

161786157 is a deficient number, since it is larger than the sum of its proper divisors (83157843).

161786157 is a wasteful number, since it uses less digits than its factorization.

161786157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2797.

The product of its digits is 70560, while the sum is 42.

The square root of 161786157 is about 12719.5187408958. The cubic root of 161786157 is about 544.8962089476.

The spelling of 161786157 in words is "one hundred sixty-one million, seven hundred eighty-six thousand, one hundred fifty-seven".