161554313 has 4 divisors (see below), whose sum is σ = 163369620. Its totient is φ = 159739008.

The previous prime is 161554307. The next prime is 161554319. The reversal of 161554313 is 313455161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 313455161 = 15091 ⋅20771.

It is an interprime number because it is at equal distance from previous prime (161554307) and next prime (161554319).

It can be written as a sum of positive squares in 2 ways, for example, as 12054784 + 149499529 = 3472^2 + 12227^2 .

It is a cyclic number.

It is not a de Polignac number, because 161554313 - 2¹⁰ = 161553289 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161554319) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 907520 + ... + 907697.

It is an arithmetic number, because the mean of its divisors is an integer number (40842405).

Almost surely, 2^161554313 is an apocalyptic number.

It is an amenable number.

161554313 is a deficient number, since it is larger than the sum of its proper divisors (1815307).

161554313 is an equidigital number, since it uses as much as digits as its factorization.

161554313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1815306.

The product of its digits is 5400, while the sum is 29.

The square root of 161554313 is about 12710.4017639097. The cubic root of 161554313 is about 544.6358007801.

The spelling of 161554313 in words is "one hundred sixty-one million, five hundred fifty-four thousand, three hundred thirteen".