161294381 has 4 divisors (see below), whose sum is σ = 161331072. Its totient is φ = 161257692.

The previous prime is 161294299. The next prime is 161294383. The reversal of 161294381 is 183492161.

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 161294381 - 2¹⁸ = 161032237 is a prime.

It is a super-2 number, since 2×161294381² = 52031754684346322, which contains 22 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161294383) 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, 10685 + ... + 20898.

It is an arithmetic number, because the mean of its divisors is an integer number (40332768).

Almost surely, 2^161294381 is an apocalyptic number.

It is an amenable number.

161294381 is a deficient number, since it is larger than the sum of its proper divisors (36691).

161294381 is an equidigital number, since it uses as much as digits as its factorization.

161294381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36690.

The product of its digits is 10368, while the sum is 35.

The square root of 161294381 is about 12700.1724791437. The cubic root of 161294381 is about 544.3435476394.

The spelling of 161294381 in words is "one hundred sixty-one million, two hundred ninety-four thousand, three hundred eighty-one".