1018878861 has 48 divisors (see below), whose sum is σ = 1834099200. Its totient is φ = 488554560.

The previous prime is 1018878827. The next prime is 1018878899. The reversal of 1018878861 is 1688788101.

It is not a de Polignac number, because 1018878861 - 2⁷ = 1018878733 is a prime.

It is a super-2 number, since 2×1018878861² = 2076228266785314642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1018878861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1018878821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25990 + ... + 52088.

It is an arithmetic number, because the mean of its divisors is an integer number (38210400).

Almost surely, 2^1018878861 is an apocalyptic number.

1018878861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1018878861 is a deficient number, since it is larger than the sum of its proper divisors (815220339).

1018878861 is a wasteful number, since it uses less digits than its factorization.

1018878861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26146 (or 26133 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 48.

The square root of 1018878861 is about 31919.8819076763. The cubic root of 1018878861 is about 1006.2537625928.

The spelling of 1018878861 in words is "one billion, eighteen million, eight hundred seventy-eight thousand, eight hundred sixty-one".