161860521 has 8 divisors (see below), whose sum is σ = 215964000. Its totient is φ = 107832032.

The previous prime is 161860481. The next prime is 161860537. The reversal of 161860521 is 125068161.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161860521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161861521) 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, 13500 + ... + 22493.

It is an arithmetic number, because the mean of its divisors is an integer number (26995500).

Almost surely, 2^161860521 is an apocalyptic number.

It is an amenable number.

161860521 is a deficient number, since it is larger than the sum of its proper divisors (54103479).

161860521 is a wasteful number, since it uses less digits than its factorization.

161860521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37495.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 161860521 is about 12722.4416288698. The cubic root of 161860521 is about 544.9796822098.

The spelling of 161860521 in words is "one hundred sixty-one million, eight hundred sixty thousand, five hundred twenty-one".