161690586 has 16 divisors (see below), whose sum is σ = 323573184. Its totient is φ = 53864864.

The previous prime is 161690579. The next prime is 161690603. The reversal of 161690586 is 685096161.

It is a happy number.

It is a super-2 number, since 2×161690586² = 52287691202046792, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4435 + ... + 18521.

It is an arithmetic number, because the mean of its divisors is an integer number (20223324).

Almost surely, 2^161690586 is an apocalyptic number.

161690586 is an abundant number, since it is smaller than the sum of its proper divisors (161882598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161690586 is a wasteful number, since it uses less digits than its factorization.

161690586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16005.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 161690586 is about 12715.7613220758. The cubic root of 161690586 is about 544.7888933524.

The spelling of 161690586 in words is "one hundred sixty-one million, six hundred ninety thousand, five hundred eighty-six".