8891261551 has 2 divisors, whose sum is σ = 8891261552. Its totient is φ = 8891261550.

The previous prime is 8891261543. The next prime is 8891261557. The reversal of 8891261551 is 1551621988.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8891261551 - 2³ = 8891261543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8891261557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4445630775 + 4445630776.

It is an arithmetic number, because the mean of its divisors is an integer number (4445630776).

Almost surely, 2^8891261551 is an apocalyptic number.

8891261551 is a deficient number, since it is larger than the sum of its proper divisors (1).

8891261551 is an equidigital number, since it uses as much as digits as its factorization.

8891261551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 46.

The square root of 8891261551 is about 94293.4862596563. The cubic root of 8891261551 is about 2071.6726312270.

The spelling of 8891261551 in words is "eight billion, eight hundred ninety-one million, two hundred sixty-one thousand, five hundred fifty-one".