1461378861 has 8 divisors (see below), whose sum is σ = 2165005760. Its totient is φ = 974252556.

The previous prime is 1461378857. The next prime is 1461378881. The reversal of 1461378861 is 1688731641.

It is not a de Polignac number, because 1461378861 - 2² = 1461378857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1461378811) 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 7 ways as a sum of consecutive naturals, for example, 27062545 + ... + 27062598.

It is an arithmetic number, because the mean of its divisors is an integer number (270625720).

Almost surely, 2^1461378861 is an apocalyptic number.

It is an amenable number.

1461378861 is a deficient number, since it is larger than the sum of its proper divisors (703626899).

1461378861 is an equidigital number, since it uses as much as digits as its factorization.

1461378861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54125152 (or 54125146 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 1461378861 is about 38227.9853118105. The cubic root of 1461378861 is about 1134.8042152285.

The spelling of 1461378861 in words is "one billion, four hundred sixty-one million, three hundred seventy-eight thousand, eight hundred sixty-one".