87221431 has 8 divisors (see below), whose sum is σ = 95523984. Its totient is φ = 78981120.

The previous prime is 87221413. The next prime is 87221437. The reversal of 87221431 is 13412278.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87221431 - 2⁹ = 87220919 is a prime.

It is a super-2 number, since 2×87221431² = 15215156051375522, which contains 22 as substring.

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 87221431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87221437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12600 + ... + 18253.

It is an arithmetic number, because the mean of its divisors is an integer number (11940498).

Almost surely, 2^87221431 is an apocalyptic number.

87221431 is a deficient number, since it is larger than the sum of its proper divisors (8302553).

87221431 is a wasteful number, since it uses less digits than its factorization.

87221431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31121.

The product of its digits is 2688, while the sum is 28.

The square root of 87221431 is about 9339.2414574204. The cubic root of 87221431 is about 443.4803713879.

It can be divided in two parts, 8722 and 1431, that added together give a triangular number (10153 = T₁₄₂).

The spelling of 87221431 in words is "eighty-seven million, two hundred twenty-one thousand, four hundred thirty-one".