87949717 has 2 divisors, whose sum is σ = 87949718. Its totient is φ = 87949716.

The previous prime is 87949709. The next prime is 87949733. The reversal of 87949717 is 71794978.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87871876 + 77841 = 9374^2 + 279^2 .

It is a cyclic number.

It is not a de Polignac number, because 87949717 - 2³ = 87949709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87940717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43974858 + 43974859.

It is an arithmetic number, because the mean of its divisors is an integer number (43974859).

Almost surely, 2^87949717 is an apocalyptic number.

It is an amenable number.

87949717 is a deficient number, since it is larger than the sum of its proper divisors (1).

87949717 is an equidigital number, since it uses as much as digits as its factorization.

87949717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 889056, while the sum is 52.

The square root of 87949717 is about 9378.1510437826. The cubic root of 87949717 is about 444.7112834948.

It can be divided in two parts, 8794971 and 7, that added together give a palindrome (8794978).

The spelling of 87949717 in words is "eighty-seven million, nine hundred forty-nine thousand, seven hundred seventeen".