87452191 has 4 divisors (see below), whose sum is σ = 88683984. Its totient is φ = 86220400.

The previous prime is 87452143. The next prime is 87452237. The reversal of 87452191 is 19125478.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19125478 = 2 ⋅9562739.

It is a cyclic number.

It is not a de Polignac number, because 87452191 - 2¹⁹ = 86927903 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87452191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87452291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 615790 + ... + 615931.

It is an arithmetic number, because the mean of its divisors is an integer number (22170996).

Almost surely, 2^87452191 is an apocalyptic number.

87452191 is a deficient number, since it is larger than the sum of its proper divisors (1231793).

87452191 is a wasteful number, since it uses less digits than its factorization.

87452191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231792.

The product of its digits is 20160, while the sum is 37.

The square root of 87452191 is about 9351.5876192227. The cubic root of 87452191 is about 443.8711293739.

The spelling of 87452191 in words is "eighty-seven million, four hundred fifty-two thousand, one hundred ninety-one".