161259261 has 8 divisors (see below), whose sum is σ = 215258304. Its totient is φ = 107383200.

The previous prime is 161259223. The next prime is 161259271. The reversal of 161259261 is 162952161.

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

It is a de Polignac number, because none of the positive numbers 2^k-161259261 is a prime.

It is a super-2 number, since 2×161259261² = 52009098516532242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161259221) 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, 27640 + ... + 32961.

It is an arithmetic number, because the mean of its divisors is an integer number (26907288).

Almost surely, 2^161259261 is an apocalyptic number.

It is an amenable number.

161259261 is a deficient number, since it is larger than the sum of its proper divisors (53999043).

161259261 is an equidigital number, since it uses as much as digits as its factorization.

161259261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61491.

The product of its digits is 6480, while the sum is 33.

The square root of 161259261 is about 12698.7897454836. The cubic root of 161259261 is about 544.3040365853.

The spelling of 161259261 in words is "one hundred sixty-one million, two hundred fifty-nine thousand, two hundred sixty-one".