1009878661 has 8 divisors (see below), whose sum is σ = 1137224448. Its totient is φ = 888456000.

The previous prime is 1009878631. The next prime is 1009878691. The reversal of 1009878661 is 1668789001.

It is an interprime number because it is at equal distance from previous prime (1009878631) and next prime (1009878691).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1009878661 - 2⁷ = 1009878533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1009878601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1480420 + ... + 1481101.

It is an arithmetic number, because the mean of its divisors is an integer number (142153056).

Almost surely, 2^1009878661 is an apocalyptic number.

1009878661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1009878661 is a deficient number, since it is larger than the sum of its proper divisors (127345787).

1009878661 is a wasteful number, since it uses less digits than its factorization.

1009878661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2961563.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 1009878661 is about 31778.5880900961. The cubic root of 1009878661 is about 1003.2821030146.

The spelling of 1009878661 in words is "one billion, nine million, eight hundred seventy-eight thousand, six hundred sixty-one".