161667097 has 4 divisors (see below), whose sum is σ = 166036516. Its totient is φ = 157297680.

The previous prime is 161667073. The next prime is 161667109. The reversal of 161667097 is 790766161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 101123136 + 60543961 = 10056^2 + 7781^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161667097 is a prime.

It is a super-2 number, since 2×161667097² = 52272500504814818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161667397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2184654 + ... + 2184727.

It is an arithmetic number, because the mean of its divisors is an integer number (41509129).

Almost surely, 2^161667097 is an apocalyptic number.

It is an amenable number.

161667097 is a deficient number, since it is larger than the sum of its proper divisors (4369419).

161667097 is an equidigital number, since it uses as much as digits as its factorization.

161667097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4369418.

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 161667097 is about 12714.8376710047. The cubic root of 161667097 is about 544.7625113464.

The spelling of 161667097 in words is "one hundred sixty-one million, six hundred sixty-seven thousand, ninety-seven".