161956497 has 8 divisors (see below), whose sum is σ = 216358560. Its totient is φ = 107762720.

The previous prime is 161956481. The next prime is 161956523. The reversal of 161956497 is 794659161.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 161956497 - 2⁴ = 161956481 is a prime.

It is a super-2 number, since 2×161956497² = 52459813841022018, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161956427) 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, 50247 + ... + 53372.

It is an arithmetic number, because the mean of its divisors is an integer number (27044820).

Almost surely, 2^161956497 is an apocalyptic number.

It is an amenable number.

161956497 is a deficient number, since it is larger than the sum of its proper divisors (54402063).

161956497 is a wasteful number, since it uses less digits than its factorization.

161956497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104143.

The product of its digits is 408240, while the sum is 48.

The square root of 161956497 is about 12726.2129873737. The cubic root of 161956497 is about 545.0873770631.

The spelling of 161956497 in words is "one hundred sixty-one million, nine hundred fifty-six thousand, four hundred ninety-seven".