87249481 has 4 divisors (see below), whose sum is σ = 95181264. Its totient is φ = 79317700.

The previous prime is 87249467. The next prime is 87249497. The reversal of 87249481 is 18494278.

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.

It is not a de Polignac number, because 87249481 - 2²¹ = 85152329 is a prime.

It is a super-2 number, since 2×87249481² = 15224943869538722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87249401) 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, 3965875 + ... + 3965896.

It is an arithmetic number, because the mean of its divisors is an integer number (23795316).

Almost surely, 2^87249481 is an apocalyptic number.

It is an amenable number.

87249481 is a deficient number, since it is larger than the sum of its proper divisors (7931783).

87249481 is a wasteful number, since it uses less digits than its factorization.

87249481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7931782.

The product of its digits is 129024, while the sum is 43.

The square root of 87249481 is about 9340.7430646603. The cubic root of 87249481 is about 443.5279066898.

The spelling of 87249481 in words is "eighty-seven million, two hundred forty-nine thousand, four hundred eighty-one".