180087261 has 4 divisors (see below), whose sum is σ = 240116352. Its totient is φ = 120058172.

The previous prime is 180087253. The next prime is 180087283. The reversal of 180087261 is 162780081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 162780081 = 3 ⋅54260027.

It is a cyclic number.

It is not a de Polignac number, because 180087261 - 2³ = 180087253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180087241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30014541 + ... + 30014546.

It is an arithmetic number, because the mean of its divisors is an integer number (60029088).

Almost surely, 2^180087261 is an apocalyptic number.

It is an amenable number.

180087261 is a deficient number, since it is larger than the sum of its proper divisors (60029091).

180087261 is an equidigital number, since it uses as much as digits as its factorization.

180087261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60029090.

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 180087261 is about 13419.6594964254. The cubic root of 180087261 is about 564.7128423053.

The spelling of 180087261 in words is "one hundred eighty million, eighty-seven thousand, two hundred sixty-one".