1955725861 has 4 divisors (see below), whose sum is σ = 2018813824. Its totient is φ = 1892637900.

The previous prime is 1955725853. The next prime is 1955725907. The reversal of 1955725861 is 1685275591.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1685275591 = 73 ⋅23085967.

It is a cyclic number.

It is not a de Polignac number, because 1955725861 - 2³ = 1955725853 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 (1955725831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31543935 + ... + 31543996.

It is an arithmetic number, because the mean of its divisors is an integer number (504703456).

Almost surely, 2^1955725861 is an apocalyptic number.

It is an amenable number.

1955725861 is a deficient number, since it is larger than the sum of its proper divisors (63087963).

1955725861 is an equidigital number, since it uses as much as digits as its factorization.

1955725861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63087962.

The product of its digits is 756000, while the sum is 49.

The square root of 1955725861 is about 44223.5894178661. The cubic root of 1955725861 is about 1250.5546042416.

The spelling of 1955725861 in words is "one billion, nine hundred fifty-five million, seven hundred twenty-five thousand, eight hundred sixty-one".