161630187 has 8 divisors (see below), whose sum is σ = 222458880. Its totient is φ = 104277480.

The previous prime is 161630167. The next prime is 161630191. The reversal of 161630187 is 781036161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161630187 - 2⁶ = 161630123 is a prime.

It is a super-2 number, since 2×161630187² = 52248634699309938, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (161630107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 868887 + ... + 869072.

It is an arithmetic number, because the mean of its divisors is an integer number (27807360).

Almost surely, 2^161630187 is an apocalyptic number.

161630187 is a deficient number, since it is larger than the sum of its proper divisors (60828693).

161630187 is a wasteful number, since it uses less digits than its factorization.

161630187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737993.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 161630187 is about 12713.3861343074. The cubic root of 161630187 is about 544.7210501893.

The spelling of 161630187 in words is "one hundred sixty-one million, six hundred thirty thousand, one hundred eighty-seven".