161391310 has 16 divisors (see below), whose sum is σ = 293221296. Its totient is φ = 63952768.

The previous prime is 161391283. The next prime is 161391311. The reversal of 161391310 is 13193161.

It is a happy number.

It is a super-2 number, since 2×161391310² = 52094309887032200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161391311) 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, 74347 + ... + 76486.

It is an arithmetic number, because the mean of its divisors is an integer number (18326331).

Almost surely, 2^161391310 is an apocalyptic number.

161391310 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161391310 is a deficient number, since it is larger than the sum of its proper divisors (131829986).

161391310 is a wasteful number, since it uses less digits than its factorization.

161391310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150947.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 161391310 is about 12703.9879565434. The cubic root of 161391310 is about 544.4525659239.

The spelling of 161391310 in words is "one hundred sixty-one million, three hundred ninety-one thousand, three hundred ten".