180872991 has 24 divisors (see below), whose sum is σ = 285981696. Its totient is φ = 109477440.

The previous prime is 180872981. The next prime is 180873001. The reversal of 180872991 is 199278081.

It is an interprime number because it is at equal distance from previous prime (180872981) and next prime (180873001).

It is not a de Polignac number, because 180872991 - 2⁵ = 180872959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180872981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5535 + ... + 19808.

It is an arithmetic number, because the mean of its divisors is an integer number (11915904).

Almost surely, 2^180872991 is an apocalyptic number.

180872991 is a deficient number, since it is larger than the sum of its proper divisors (105108705).

180872991 is a wasteful number, since it uses less digits than its factorization.

180872991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25423 (or 25420 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 45.

The square root of 180872991 is about 13448.9029664133. The cubic root of 180872991 is about 565.5329411586.

The spelling of 180872991 in words is "one hundred eighty million, eight hundred seventy-two thousand, nine hundred ninety-one".