87619517 has 2 divisors, whose sum is σ = 87619518. Its totient is φ = 87619516.

The previous prime is 87619463. The next prime is 87619523. The reversal of 87619517 is 71591678.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86508601 + 1110916 = 9301^2 + 1054^2 .

It is a cyclic number.

It is not a de Polignac number, because 87619517 - 2⁸ = 87619261 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87619537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43809758 + 43809759.

It is an arithmetic number, because the mean of its divisors is an integer number (43809759).

Almost surely, 2^87619517 is an apocalyptic number.

It is an amenable number.

87619517 is a deficient number, since it is larger than the sum of its proper divisors (1).

87619517 is an equidigital number, since it uses as much as digits as its factorization.

87619517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 44.

The square root of 87619517 is about 9360.5297392829. The cubic root of 87619517 is about 444.1540415239.

The spelling of 87619517 in words is "eighty-seven million, six hundred nineteen thousand, five hundred seventeen".