87311511 has 48 divisors (see below), whose sum is σ = 149160960. Its totient is φ = 48185280.

The previous prime is 87311461. The next prime is 87311513. The reversal of 87311511 is 11511378.

It is not a de Polignac number, because 87311511 - 2⁶ = 87311447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87311513) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 263616 + ... + 263946.

It is an arithmetic number, because the mean of its divisors is an integer number (3107520).

Almost surely, 2^87311511 is an apocalyptic number.

87311511 is a deficient number, since it is larger than the sum of its proper divisors (61849449).

87311511 is a wasteful number, since it uses less digits than its factorization.

87311511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476 (or 473 counting only the distinct ones).

The product of its digits is 840, while the sum is 27.

The square root of 87311511 is about 9344.0628743604. The cubic root of 87311511 is about 443.6329904810.

Adding to 87311511 its reverse (11511378), we get a palindrome (98822889).

The spelling of 87311511 in words is "eighty-seven million, three hundred eleven thousand, five hundred eleven".