161725587 has 16 divisors (see below), whose sum is σ = 230098560. Its totient is φ = 100740672.

The previous prime is 161725559. The next prime is 161725609. The reversal of 161725587 is 785527161.

It is not a de Polignac number, because 161725587 - 2⁸ = 161725331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161725517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15273 + ... + 23594.

It is an arithmetic number, because the mean of its divisors is an integer number (14381160).

Almost surely, 2^161725587 is an apocalyptic number.

161725587 is a deficient number, since it is larger than the sum of its proper divisors (68372973).

161725587 is a wasteful number, since it uses less digits than its factorization.

161725587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38962.

The product of its digits is 117600, while the sum is 42.

The square root of 161725587 is about 12717.1375316932. The cubic root of 161725587 is about 544.8282004858.

The spelling of 161725587 in words is "one hundred sixty-one million, seven hundred twenty-five thousand, five hundred eighty-seven".