87222149 has 4 divisors (see below), whose sum is σ = 99682464. Its totient is φ = 74761836.

The previous prime is 87222139. The next prime is 87222181. The reversal of 87222149 is 94122278.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94122278 = 2 ⋅47061139.

It is a cyclic number.

It is not a de Polignac number, because 87222149 - 2⁴ = 87222133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87222139) 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, 6230147 + ... + 6230160.

It is an arithmetic number, because the mean of its divisors is an integer number (24920616).

Almost surely, 2^87222149 is an apocalyptic number.

It is an amenable number.

87222149 is a deficient number, since it is larger than the sum of its proper divisors (12460315).

87222149 is a wasteful number, since it uses less digits than its factorization.

87222149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12460314.

The product of its digits is 16128, while the sum is 35.

The square root of 87222149 is about 9339.2798972940. The cubic root of 87222149 is about 443.4815882832.

The spelling of 87222149 in words is "eighty-seven million, two hundred twenty-two thousand, one hundred forty-nine".