161274523 has 4 divisors (see below), whose sum is σ = 161369848. Its totient is φ = 161179200.

The previous prime is 161274521. The next prime is 161274557. The reversal of 161274523 is 325472161.

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

It is a cyclic number.

It is not a de Polignac number, because 161274523 - 2¹ = 161274521 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161274521) 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, 45078 + ... + 48523.

It is an arithmetic number, because the mean of its divisors is an integer number (40342462).

Almost surely, 2^161274523 is an apocalyptic number.

161274523 is a deficient number, since it is larger than the sum of its proper divisors (95325).

161274523 is an equidigital number, since it uses as much as digits as its factorization.

161274523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95324.

The product of its digits is 10080, while the sum is 31.

The square root of 161274523 is about 12699.3906546732. The cubic root of 161274523 is about 544.3212074981.

The spelling of 161274523 in words is "one hundred sixty-one million, two hundred seventy-four thousand, five hundred twenty-three".