161530258 has 8 divisors (see below), whose sum is σ = 247450752. Its totient is φ = 79046676.

The previous prime is 161530253. The next prime is 161530289. The reversal of 161530258 is 852035161.

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

It is not an unprimeable number, because it can be changed into a prime (161530253) 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, 859110 + ... + 859297.

It is an arithmetic number, because the mean of its divisors is an integer number (30931344).

Almost surely, 2^161530258 is an apocalyptic number.

161530258 is a deficient number, since it is larger than the sum of its proper divisors (85920494).

161530258 is a wasteful number, since it uses less digits than its factorization.

161530258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1718456.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 161530258 is about 12709.4554564702. The cubic root of 161530258 is about 544.6087678394.

It can be divided in two parts, 1615302 and 58, that multiplied together give a triangular number (93687516 = T₁₃₆₈₈).

The spelling of 161530258 in words is "one hundred sixty-one million, five hundred thirty thousand, two hundred fifty-eight".