1117880781 has 16 divisors (see below), whose sum is σ = 1581358464. Its totient is φ = 700004864.

The previous prime is 1117880779. The next prime is 1117880791. The reversal of 1117880781 is 1870887111.

It is a cyclic number.

It is not a de Polignac number, because 1117880781 - 2¹ = 1117880779 is a prime.

It is a super-2 number, since 2×1117880781² = 2499314881058339922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1117880791) 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, 3865 + ... + 47441.

It is an arithmetic number, because the mean of its divisors is an integer number (98834904).

Almost surely, 2^1117880781 is an apocalyptic number.

It is an amenable number.

1117880781 is a deficient number, since it is larger than the sum of its proper divisors (463477683).

1117880781 is a wasteful number, since it uses less digits than its factorization.

1117880781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44100.

The product of its (nonzero) digits is 25088, while the sum is 42.

The square root of 1117880781 is about 33434.7241801095. The cubic root of 1117880781 is about 1037.8434048985.

The spelling of 1117880781 in words is "one billion, one hundred seventeen million, eight hundred eighty thousand, seven hundred eighty-one".