87517501 has 2 divisors, whose sum is σ = 87517502. Its totient is φ = 87517500.

The previous prime is 87517499. The next prime is 87517523. The reversal of 87517501 is 10571578.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44876601 + 42640900 = 6699^2 + 6530^2 .

It is a cyclic number.

It is not a de Polignac number, because 87517501 - 2¹ = 87517499 is a prime.

Together with 87517499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87517541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43758750 + 43758751.

It is an arithmetic number, because the mean of its divisors is an integer number (43758751).

Almost surely, 2^87517501 is an apocalyptic number.

87517501 is the 5001-st centered heptagonal number.

It is an amenable number.

87517501 is a deficient number, since it is larger than the sum of its proper divisors (1).

87517501 is an equidigital number, since it uses as much as digits as its factorization.

87517501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9800, while the sum is 34.

The square root of 87517501 is about 9355.0788879624. The cubic root of 87517501 is about 443.9815973895.

The spelling of 87517501 in words is "eighty-seven million, five hundred seventeen thousand, five hundred one".