87222431 has 4 divisors (see below), whose sum is σ = 89579832. Its totient is φ = 84865032.

The previous prime is 87222419. The next prime is 87222439. The reversal of 87222431 is 13422278.

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

It is a cyclic number.

It is not a de Polignac number, because 87222431 - 2¹⁴ = 87206047 is a prime.

It is a super-2 number, since 2×87222431² = 15215504939099522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87222394 and 87222403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87222439) 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, 1178645 + ... + 1178718.

It is an arithmetic number, because the mean of its divisors is an integer number (22394958).

Almost surely, 2^87222431 is an apocalyptic number.

87222431 is a deficient number, since it is larger than the sum of its proper divisors (2357401).

87222431 is a wasteful number, since it uses less digits than its factorization.

87222431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2357400.

The product of its digits is 5376, while the sum is 29.

The square root of 87222431 is about 9339.2949948056. The cubic root of 87222431 is about 443.4820662263.

The spelling of 87222431 in words is "eighty-seven million, two hundred twenty-two thousand, four hundred thirty-one".