87531641 has 4 divisors (see below), whose sum is σ = 87568884. Its totient is φ = 87494400.

The previous prime is 87531611. The next prime is 87531649. The reversal of 87531641 is 14613578.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16483600 + 71048041 = 4060^2 + 8429^2 .

It is a cyclic number.

It is not a de Polignac number, because 87531641 - 2¹⁴ = 87515257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87531649) 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, 14840 + ... + 19881.

It is an arithmetic number, because the mean of its divisors is an integer number (21892221).

Almost surely, 2^87531641 is an apocalyptic number.

It is an amenable number.

87531641 is a deficient number, since it is larger than the sum of its proper divisors (37243).

87531641 is a wasteful number, since it uses less digits than its factorization.

87531641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37242.

The product of its digits is 20160, while the sum is 35.

The square root of 87531641 is about 9355.8345966568. The cubic root of 87531641 is about 444.0055071281.

The spelling of 87531641 in words is "eighty-seven million, five hundred thirty-one thousand, six hundred forty-one".