161351786 has 8 divisors (see below), whose sum is σ = 242348004. Its totient is φ = 80569120.

The previous prime is 161351779. The next prime is 161351789. The reversal of 161351786 is 687153161.

It can be written as a sum of positive squares in 2 ways, for example, as 133841761 + 27510025 = 11569^2 + 5245^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161351789) 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, 51485 + ... + 54528.

Almost surely, 2^161351786 is an apocalyptic number.

161351786 is a deficient number, since it is larger than the sum of its proper divisors (80996218).

161351786 is a wasteful number, since it uses less digits than its factorization.

161351786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106776.

The product of its digits is 30240, while the sum is 38.

The square root of 161351786 is about 12702.4322867709. The cubic root of 161351786 is about 544.4081176404.

The spelling of 161351786 in words is "one hundred sixty-one million, three hundred fifty-one thousand, seven hundred eighty-six".