161690349 has 8 divisors (see below), whose sum is σ = 228268800. Its totient is φ = 101452736.

The previous prime is 161690339. The next prime is 161690351. The reversal of 161690349 is 943096161.

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

It is not a de Polignac number, because 161690349 - 2⁵ = 161690317 is a prime.

It is a super-2 number, since 2×161690349² = 52287537919483602, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161690329) 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, 1585149 + ... + 1585250.

It is an arithmetic number, because the mean of its divisors is an integer number (28533600).

Almost surely, 2^161690349 is an apocalyptic number.

It is an amenable number.

161690349 is a deficient number, since it is larger than the sum of its proper divisors (66578451).

161690349 is a wasteful number, since it uses less digits than its factorization.

161690349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3170419.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 161690349 is about 12715.7520029293. The cubic root of 161690349 is about 544.7886271752.

The spelling of 161690349 in words is "one hundred sixty-one million, six hundred ninety thousand, three hundred forty-nine".