87744550381 has 2 divisors, whose sum is σ = 87744550382. Its totient is φ = 87744550380.

The previous prime is 87744550367. The next prime is 87744550393. The reversal of 87744550381 is 18305544778.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55260255625 + 32484294756 = 235075^2 + 180234^2 .

It is a cyclic number.

It is not a de Polignac number, because 87744550381 - 2³¹ = 85597066733 is a prime.

It is a super-3 number, since 3×87744550381³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87744550081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43872275190 + 43872275191.

It is an arithmetic number, because the mean of its divisors is an integer number (43872275191).

Almost surely, 2^87744550381 is an apocalyptic number.

It is an amenable number.

87744550381 is a deficient number, since it is larger than the sum of its proper divisors (1).

87744550381 is an equidigital number, since it uses as much as digits as its factorization.

87744550381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3763200, while the sum is 52.

The spelling of 87744550381 in words is "eighty-seven billion, seven hundred forty-four million, five hundred fifty thousand, three hundred eighty-one".