161155450 has 12 divisors (see below), whose sum is σ = 299749230. Its totient is φ = 64462160.

The previous prime is 161155441. The next prime is 161155451. The reversal of 161155450 is 54551161.

It is a happy number.

161155450 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 139074849 + 22080601 = 11793^2 + 4699^2 .

It is not an unprimeable number, because it can be changed into a prime (161155451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1611505 + ... + 1611604.

Almost surely, 2^161155450 is an apocalyptic number.

161155450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161155450 is a deficient number, since it is larger than the sum of its proper divisors (138593780).

161155450 is a wasteful number, since it uses less digits than its factorization.

161155450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3223121 (or 3223116 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 28.

The square root of 161155450 is about 12694.7016506888. The cubic root of 161155450 is about 544.1872125440.

The spelling of 161155450 in words is "one hundred sixty-one million, one hundred fifty-five thousand, four hundred fifty".