9891261552 has 20 divisors (see below), whose sum is σ = 25552425800. Its totient is φ = 3297087168.

The previous prime is 9891261529. The next prime is 9891261607. The reversal of 9891261552 is 2551621989.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 206067949 = 9891261552 / (9 + 8 + 9 + 1 + 2 + 6 + 1 + 5 + 5 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103033927 + ... + 103034022.

It is an arithmetic number, because the mean of its divisors is an integer number (1277621290).

Almost surely, 2^9891261552 is an apocalyptic number.

It is an amenable number.

9891261552 is an abundant number, since it is smaller than the sum of its proper divisors (15661164248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9891261552 is a wasteful number, since it uses less digits than its factorization.

9891261552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206067960 (or 206067954 counting only the distinct ones).

The product of its digits is 388800, while the sum is 48.

The square root of 9891261552 is about 99454.8216629038. The cubic root of 9891261552 is about 2146.5972170391.

The spelling of 9891261552 in words is "nine billion, eight hundred ninety-one million, two hundred sixty-one thousand, five hundred fifty-two".