161287402 has 12 divisors (see below), whose sum is σ = 244704006. Its totient is φ = 79729760.

The previous prime is 161287397. The next prime is 161287421. The reversal of 161287402 is 204782161.

161287402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 98227921 + 63059481 = 9911^2 + 7941^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10752 + ... + 20932.

Almost surely, 2^161287402 is an apocalyptic number.

161287402 is a deficient number, since it is larger than the sum of its proper divisors (83416604).

161287402 is an equidigital number, since it uses as much as digits as its factorization.

161287402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10361 (or 10272 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 161287402 is about 12699.8977161235. The cubic root of 161287402 is about 544.3356965116.

The spelling of 161287402 in words is "one hundred sixty-one million, two hundred eighty-seven thousand, four hundred two".