1117020861 has 80 divisors (see below), whose sum is σ = 1931601408. Its totient is φ = 636854400.

The previous prime is 1117020859. The next prime is 1117020881. The reversal of 1117020861 is 1680207111.

It is not a de Polignac number, because 1117020861 - 2¹ = 1117020859 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1117020881) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1021431 + ... + 1022523.

Almost surely, 2^1117020861 is an apocalyptic number.

1117020861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1117020861 is a deficient number, since it is larger than the sum of its proper divisors (814580547).

1117020861 is a wasteful number, since it uses less digits than its factorization.

1117020861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184 (or 1175 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 27.

The square root of 1117020861 is about 33421.8620217366. The cubic root of 1117020861 is about 1037.5772193167.

Adding to 1117020861 its reverse (1680207111), we get a palindrome (2797227972).

The spelling of 1117020861 in words is "one billion, one hundred seventeen million, twenty thousand, eight hundred sixty-one".