11278520281 has 16 divisors (see below), whose sum is σ = 13471202304. Its totient is φ = 9232519824.

The previous prime is 11278520263. The next prime is 11278520311. The reversal of 11278520281 is 18202587211.

It is a cyclic number.

It is not a de Polignac number, because 11278520281 - 2²¹ = 11276423129 is a prime.

It is a super-2 number, since 2×11278520281² (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 11278520281.

It is not an unprimeable number, because it can be changed into a prime (11278520261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49050 + ... + 157996.

It is an arithmetic number, because the mean of its divisors is an integer number (841950144).

Almost surely, 2^11278520281 is an apocalyptic number.

It is an amenable number.

11278520281 is a deficient number, since it is larger than the sum of its proper divisors (2192682023).

11278520281 is a wasteful number, since it uses less digits than its factorization.

11278520281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109620.

The product of its (nonzero) digits is 17920, while the sum is 37.

The spelling of 11278520281 in words is "eleven billion, two hundred seventy-eight million, five hundred twenty thousand, two hundred eighty-one".