981212747 has 4 divisors (see below), whose sum is σ = 982108296. Its totient is φ = 980317200.

The previous prime is 981212719. The next prime is 981212753. The reversal of 981212747 is 747212189.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 981212747 - 2¹⁸ = 980950603 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981212717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 446129 + ... + 448322.

It is an arithmetic number, because the mean of its divisors is an integer number (245527074).

Almost surely, 2^981212747 is an apocalyptic number.

981212747 is a deficient number, since it is larger than the sum of its proper divisors (895549).

981212747 is a wasteful number, since it uses less digits than its factorization.

981212747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 895548.

The product of its digits is 56448, while the sum is 41.

The square root of 981212747 is about 31324.3155870962. The cubic root of 981212747 is about 993.6979499286.

The spelling of 981212747 in words is "nine hundred eighty-one million, two hundred twelve thousand, seven hundred forty-seven".