157171985 has 8 divisors (see below), whose sum is σ = 188784000. Its totient is φ = 125619184.

The previous prime is 157171981. The next prime is 157171999. The reversal of 157171985 is 589171751.

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 157171985 - 2² = 157171981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (157171981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8735 + ... + 19764.

It is an arithmetic number, because the mean of its divisors is an integer number (23598000).

Almost surely, 2^157171985 is an apocalyptic number.

It is an amenable number.

157171985 is a deficient number, since it is larger than the sum of its proper divisors (31612015).

157171985 is a wasteful number, since it uses less digits than its factorization.

157171985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29607.

The product of its digits is 88200, while the sum is 44.

The square root of 157171985 is about 12536.8251563145. The cubic root of 157171985 is about 539.6659857123.

The spelling of 157171985 in words is "one hundred fifty-seven million, one hundred seventy-one thousand, nine hundred eighty-five".