161310621 has 8 divisors (see below), whose sum is σ = 215197024. Its totient is φ = 107482320.

The previous prime is 161310613. The next prime is 161310623. The reversal of 161310621 is 126013161.

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

It is not a de Polignac number, because 161310621 - 2³ = 161310613 is a prime.

It is a super-2 number, since 2×161310621² = 52042232894811282, 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 (161310623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7570 + ... + 19491.

It is an arithmetic number, because the mean of its divisors is an integer number (26899628).

Almost surely, 2^161310621 is an apocalyptic number.

It is an amenable number.

161310621 is a deficient number, since it is larger than the sum of its proper divisors (53886403).

161310621 is a wasteful number, since it uses less digits than its factorization.

161310621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29051.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 161310621 is about 12700.8118244465. The cubic root of 161310621 is about 544.3618161877.

Adding to 161310621 its reverse (126013161), we get a palindrome (287323782).

The spelling of 161310621 in words is "one hundred sixty-one million, three hundred ten thousand, six hundred twenty-one".