161235551 has 8 divisors (see below), whose sum is σ = 163495920. Its totient is φ = 158982912.

The previous prime is 161235527. The next prime is 161235559. The reversal of 161235551 is 155532161.

161235551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 161235551 - 2¹⁰ = 161234527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161235559) 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, 49295 + ... + 52463.

It is an arithmetic number, because the mean of its divisors is an integer number (20436990).

Almost surely, 2^161235551 is an apocalyptic number.

161235551 is a deficient number, since it is larger than the sum of its proper divisors (2260369).

161235551 is an equidigital number, since it uses as much as digits as its factorization.

161235551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3865.

The product of its digits is 4500, while the sum is 29.

The square root of 161235551 is about 12697.8561576354. The cubic root of 161235551 is about 544.2773588797.

The spelling of 161235551 in words is "one hundred sixty-one million, two hundred thirty-five thousand, five hundred fifty-one".