9124721281 has 8 divisors (see below), whose sum is σ = 9922028480. Its totient is φ = 8341043472.

The previous prime is 9124721267. The next prime is 9124721311. The reversal of 9124721281 is 1821274219.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9124721281 - 2²⁵ = 9091166849 is a prime.

It is a super-2 number, since 2×9124721281² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9124721281.

It is not an unprimeable number, because it can be changed into a prime (9124721681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3405951 + ... + 3408628.

It is an arithmetic number, because the mean of its divisors is an integer number (1240253560).

Almost surely, 2^9124721281 is an apocalyptic number.

It is an amenable number.

9124721281 is a deficient number, since it is larger than the sum of its proper divisors (797307199).

9124721281 is a wasteful number, since it uses less digits than its factorization.

9124721281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6814695.

The product of its digits is 16128, while the sum is 37.

The square root of 9124721281 is about 95523.4069796508. The cubic root of 9124721281 is about 2089.6483219696.

The spelling of 9124721281 in words is "nine billion, one hundred twenty-four million, seven hundred twenty-one thousand, two hundred eighty-one".