87491233 has 4 divisors (see below), whose sum is σ = 88048660. Its totient is φ = 86933808.

The previous prime is 87491177. The next prime is 87491249. The reversal of 87491233 is 33219478.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27164944 + 60326289 = 5212^2 + 7767^2 .

It is a cyclic number.

It is not a de Polignac number, because 87491233 - 2¹³ = 87483041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87491192 and 87491201.

It is not an unprimeable number, because it can be changed into a prime (87491533) 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 3 ways as a sum of consecutive naturals, for example, 278478 + ... + 278791.

It is an arithmetic number, because the mean of its divisors is an integer number (22012165).

Almost surely, 2^87491233 is an apocalyptic number.

It is an amenable number.

87491233 is a deficient number, since it is larger than the sum of its proper divisors (557427).

87491233 is a wasteful number, since it uses less digits than its factorization.

87491233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557426.

The product of its digits is 36288, while the sum is 37.

The square root of 87491233 is about 9353.6748393345. The cubic root of 87491233 is about 443.9371732249.

The spelling of 87491233 in words is "eighty-seven million, four hundred ninety-one thousand, two hundred thirty-three".