87021988741 has 2 divisors, whose sum is σ = 87021988742. Its totient is φ = 87021988740.

The previous prime is 87021988733. The next prime is 87021988769. The reversal of 87021988741 is 14788912078.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49226740641 + 37795248100 = 221871^2 + 194410^2 .

It is a cyclic number.

It is not a de Polignac number, because 87021988741 - 2³ = 87021988733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87021988441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43510994370 + 43510994371.

It is an arithmetic number, because the mean of its divisors is an integer number (43510994371).

Almost surely, 2^87021988741 is an apocalyptic number.

It is an amenable number.

87021988741 is a deficient number, since it is larger than the sum of its proper divisors (1).

87021988741 is an equidigital number, since it uses as much as digits as its factorization.

87021988741 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1806336, while the sum is 55.

The spelling of 87021988741 in words is "eighty-seven billion, twenty-one million, nine hundred eighty-eight thousand, seven hundred forty-one".