161481719 has 4 divisors (see below), whose sum is σ = 184550544. Its totient is φ = 138412896.

The previous prime is 161481713. The next prime is 161481731. The reversal of 161481719 is 917184161.

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 161481719 - 2¹² = 161477623 is a prime.

It is a super-2 number, since 2×161481719² = 52152691142389922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161481713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11534402 + ... + 11534415.

It is an arithmetic number, because the mean of its divisors is an integer number (46137636).

Almost surely, 2^161481719 is an apocalyptic number.

161481719 is a deficient number, since it is larger than the sum of its proper divisors (23068825).

161481719 is an equidigital number, since it uses as much as digits as its factorization.

161481719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23068824.

The product of its digits is 12096, while the sum is 38.

The square root of 161481719 is about 12707.5457504587. The cubic root of 161481719 is about 544.5542116764.

The spelling of 161481719 in words is "one hundred sixty-one million, four hundred eighty-one thousand, seven hundred nineteen".