87563531 has 8 divisors (see below), whose sum is σ = 95742000. Its totient is φ = 79421440.

The previous prime is 87563527. The next prime is 87563537. The reversal of 87563531 is 13536578.

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 87563531 - 2² = 87563527 is a prime.

It is a super-2 number, since 2×87563531² = 15334743922375922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87563537) 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, 3926 + ... + 13803.

It is an arithmetic number, because the mean of its divisors is an integer number (11967750).

Almost surely, 2^87563531 is an apocalyptic number.

87563531 is a deficient number, since it is larger than the sum of its proper divisors (8178469).

87563531 is a wasteful number, since it uses less digits than its factorization.

87563531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18189.

The product of its digits is 75600, while the sum is 38.

The square root of 87563531 is about 9357.5387255410. The cubic root of 87563531 is about 444.0594214090.

The spelling of 87563531 in words is "eighty-seven million, five hundred sixty-three thousand, five hundred thirty-one".