161967457 has 4 divisors (see below), whose sum is σ = 170492080. Its totient is φ = 153442836.

The previous prime is 161967437. The next prime is 161967461. The reversal of 161967457 is 754769161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161967457 - 2²³ = 153578849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161967437) 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, 4262283 + ... + 4262320.

It is an arithmetic number, because the mean of its divisors is an integer number (42623020).

Almost surely, 2^161967457 is an apocalyptic number.

It is an amenable number.

161967457 is a deficient number, since it is larger than the sum of its proper divisors (8524623).

161967457 is an equidigital number, since it uses as much as digits as its factorization.

161967457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8524622.

The product of its digits is 317520, while the sum is 46.

The square root of 161967457 is about 12726.6435873721. The cubic root of 161967457 is about 545.0996725931.

It can be divided in two parts, 16196 and 7457, that added together give a triangular number (23653 = T₂₁₇).

The spelling of 161967457 in words is "one hundred sixty-one million, nine hundred sixty-seven thousand, four hundred fifty-seven".