161281587 has 8 divisors (see below), whose sum is σ = 215259280. Its totient is φ = 107412480.

The previous prime is 161281583. The next prime is 161281591. The reversal of 161281587 is 785182161.

It is an interprime number because it is at equal distance from previous prime (161281583) and next prime (161281591).

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

It is not a de Polignac number, because 161281587 - 2² = 161281583 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161281583) 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, 23614 + ... + 29667.

It is an arithmetic number, because the mean of its divisors is an integer number (26907410).

Almost surely, 2^161281587 is an apocalyptic number.

161281587 is a deficient number, since it is larger than the sum of its proper divisors (53977693).

161281587 is a wasteful number, since it uses less digits than its factorization.

161281587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54293.

The product of its digits is 26880, while the sum is 39.

The square root of 161281587 is about 12699.6687752083. The cubic root of 161281587 is about 544.3291546696.

The spelling of 161281587 in words is "one hundred sixty-one million, two hundred eighty-one thousand, five hundred eighty-seven".