161438457 has 4 divisors (see below), whose sum is σ = 215251280. Its totient is φ = 107625636.

The previous prime is 161438441. The next prime is 161438507. The reversal of 161438457 is 754834161.

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 not a de Polignac number, because 161438457 - 2⁴ = 161438441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161438657) 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, 26906407 + ... + 26906412.

It is an arithmetic number, because the mean of its divisors is an integer number (53812820).

Almost surely, 2^161438457 is an apocalyptic number.

It is an amenable number.

161438457 is a deficient number, since it is larger than the sum of its proper divisors (53812823).

161438457 is an equidigital number, since it uses as much as digits as its factorization.

161438457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53812822.

The product of its digits is 80640, while the sum is 39.

The square root of 161438457 is about 12705.8434194665. The cubic root of 161438457 is about 544.5055774645.

The spelling of 161438457 in words is "one hundred sixty-one million, four hundred thirty-eight thousand, four hundred fifty-seven".