161258361 has 8 divisors (see below), whose sum is σ = 234557664. Its totient is φ = 97732320.

The previous prime is 161258353. The next prime is 161258389. The reversal of 161258361 is 163852161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161258361 - 2³ = 161258353 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 4886617 = 161258361 / (1 + 6 + 1 + 2 + 5 + 8 + 3 + 6 + 1).

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

It is not an unprimeable number, because it can be changed into a prime (161258341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2443276 + ... + 2443341.

It is an arithmetic number, because the mean of its divisors is an integer number (29319708).

Almost surely, 2^161258361 is an apocalyptic number.

161258361 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161258361 is a deficient number, since it is larger than the sum of its proper divisors (73299303).

161258361 is a wasteful number, since it uses less digits than its factorization.

161258361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4886631.

The product of its digits is 8640, while the sum is 33.

The square root of 161258361 is about 12698.7543089864. The cubic root of 161258361 is about 544.3030239829.

The spelling of 161258361 in words is "one hundred sixty-one million, two hundred fifty-eight thousand, three hundred sixty-one".