161402513 has 4 divisors (see below), whose sum is σ = 162883380. Its totient is φ = 159921648.

The previous prime is 161402497. The next prime is 161402581. The reversal of 161402513 is 315204161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 315204161 = 29 ⋅10869109.

It can be written as a sum of positive squares in 2 ways, for example, as 98565184 + 62837329 = 9928^2 + 7927^2 .

It is a cyclic number.

It is not a de Polignac number, because 161402513 - 2⁴ = 161402497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161402113) 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, 740270 + ... + 740487.

It is an arithmetic number, because the mean of its divisors is an integer number (40720845).

Almost surely, 2^161402513 is an apocalyptic number.

It is an amenable number.

161402513 is a deficient number, since it is larger than the sum of its proper divisors (1480867).

161402513 is a wasteful number, since it uses less digits than its factorization.

161402513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1480866.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 161402513 is about 12704.4288734284. The cubic root of 161402513 is about 544.4651633823.

Adding to 161402513 its reverse (315204161), we get a palindrome (476606674).

The spelling of 161402513 in words is "one hundred sixty-one million, four hundred two thousand, five hundred thirteen".