1920870261 has 8 divisors (see below), whose sum is σ = 2845733760. Its totient is φ = 1280580156.

The previous prime is 1920870251. The next prime is 1920870269. The reversal of 1920870261 is 1620780291.

It is not a de Polignac number, because 1920870261 - 2⁵ = 1920870229 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1920870269) 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, 35571645 + ... + 35571698.

It is an arithmetic number, because the mean of its divisors is an integer number (355716720).

Almost surely, 2^1920870261 is an apocalyptic number.

It is an amenable number.

1920870261 is a deficient number, since it is larger than the sum of its proper divisors (924863499).

1920870261 is an equidigital number, since it uses as much as digits as its factorization.

1920870261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71143352 (or 71143346 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 1920870261 is about 43827.7339249932. The cubic root of 1920870261 is about 1243.0807589660.

The spelling of 1920870261 in words is "one billion, nine hundred twenty million, eight hundred seventy thousand, two hundred sixty-one".