87749861 has 2 divisors, whose sum is σ = 87749862. Its totient is φ = 87749860.

The previous prime is 87749843. The next prime is 87749873. The reversal of 87749861 is 16894778.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86136961 + 1612900 = 9281^2 + 1270^2 .

It is a cyclic number.

It is not a de Polignac number, because 87749861 - 2¹⁸ = 87487717 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 (87743861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43874930 + 43874931.

It is an arithmetic number, because the mean of its divisors is an integer number (43874931).

Almost surely, 2^87749861 is an apocalyptic number.

It is an amenable number.

87749861 is a deficient number, since it is larger than the sum of its proper divisors (1).

87749861 is an equidigital number, since it uses as much as digits as its factorization.

87749861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 50.

The square root of 87749861 is about 9367.4895783235. The cubic root of 87749861 is about 444.3741756245.

The spelling of 87749861 in words is "eighty-seven million, seven hundred forty-nine thousand, eight hundred sixty-one".