161197477 has 8 divisors (see below), whose sum is σ = 186820992. Its totient is φ = 136222800.

The previous prime is 161197469. The next prime is 161197481. The reversal of 161197477 is 774791161.

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

It is not a de Polignac number, because 161197477 - 2³ = 161197469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161197447) 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, 161674 + ... + 162667.

It is an arithmetic number, because the mean of its divisors is an integer number (23352624).

Almost surely, 2^161197477 is an apocalyptic number.

It is an amenable number.

161197477 is a deficient number, since it is larger than the sum of its proper divisors (25623515).

161197477 is an equidigital number, since it uses as much as digits as its factorization.

161197477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324419.

The product of its digits is 74088, while the sum is 43.

The square root of 161197477 is about 12696.3568396607. The cubic root of 161197477 is about 544.2345138053.

The spelling of 161197477 in words is "one hundred sixty-one million, one hundred ninety-seven thousand, four hundred seventy-seven".