1011881651 has 16 divisors (see below), whose sum is σ = 1166659200. Its totient is φ = 867960000.

The previous prime is 1011881627. The next prime is 1011881687. The reversal of 1011881651 is 1561881101.

It is a cyclic number.

It is not a de Polignac number, because 1011881651 - 2²² = 1007687347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1011881621) 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, 42815 + ... + 62103.

It is an arithmetic number, because the mean of its divisors is an integer number (72916200).

Almost surely, 2^1011881651 is an apocalyptic number.

1011881651 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1011881651 is a deficient number, since it is larger than the sum of its proper divisors (154777549).

1011881651 is a wasteful number, since it uses less digits than its factorization.

1011881651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19570.

The product of its (nonzero) digits is 1920, while the sum is 32.

The square root of 1011881651 is about 31810.0872523167. The cubic root of 1011881651 is about 1003.9449671030.

The spelling of 1011881651 in words is "one billion, eleven million, eight hundred eighty-one thousand, six hundred fifty-one".