161551452 has 24 divisors (see below), whose sum is σ = 396793600. Its totient is φ = 51016176.

The previous prime is 161551451. The next prime is 161551469. The reversal of 161551452 is 254155161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161551451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 354052 + ... + 354507.

Almost surely, 2^161551452 is an apocalyptic number.

161551452 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161551452 is an abundant number, since it is smaller than the sum of its proper divisors (235242148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161551452 is a wasteful number, since it uses less digits than its factorization.

161551452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708585 (or 708583 counting only the distinct ones).

The product of its digits is 6000, while the sum is 30.

The square root of 161551452 is about 12710.2892177952. The cubic root of 161551452 is about 544.6325857371.

The spelling of 161551452 in words is "one hundred sixty-one million, five hundred fifty-one thousand, four hundred fifty-two".