161312810 has 16 divisors (see below), whose sum is σ = 290591496. Its totient is φ = 64474368.

The previous prime is 161312797. The next prime is 161312821. The reversal of 161312810 is 18213161.

It can be written as a sum of positive squares in 4 ways, for example, as 159997201 + 1315609 = 12649^2 + 1147^2 .

It is a super-2 number, since 2×161312810² = 52043645340192200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8702 + ... + 19958.

Almost surely, 2^161312810 is an apocalyptic number.

161312810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161312810 is a deficient number, since it is larger than the sum of its proper divisors (129278686).

161312810 is a wasteful number, since it uses less digits than its factorization.

161312810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12697.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 161312810 is about 12700.8979997479. The cubic root of 161312810 is about 544.3642785232.

Adding to 161312810 its reverse (18213161), we get a palindrome (179525971).

The spelling of 161312810 in words is "one hundred sixty-one million, three hundred twelve thousand, eight hundred ten".