161906523 has 8 divisors (see below), whose sum is σ = 218476608. Its totient is φ = 106637064.

The previous prime is 161906519. The next prime is 161906539. The reversal of 161906523 is 325609161.

It is a happy number.

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

It is not a de Polignac number, because 161906523 - 2² = 161906519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161902523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324865 + ... + 325362.

It is an arithmetic number, because the mean of its divisors is an integer number (27309576).

Almost surely, 2^161906523 is an apocalyptic number.

161906523 is a deficient number, since it is larger than the sum of its proper divisors (56570085).

161906523 is an equidigital number, since it uses as much as digits as its factorization.

161906523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650313.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 161906523 is about 12724.2494081183. The cubic root of 161906523 is about 545.0313064529.

The spelling of 161906523 in words is "one hundred sixty-one million, nine hundred six thousand, five hundred twenty-three".