1955540857 has 4 divisors (see below), whose sum is σ = 2058464080. Its totient is φ = 1852617636.

The previous prime is 1955540837. The next prime is 1955540861. The reversal of 1955540857 is 7580455591.

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: 7580455591 = 60497 ⋅125303.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1955540857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1955540857.

It is not an unprimeable number, because it can be changed into a prime (1955540827) 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 3 ways as a sum of consecutive naturals, for example, 51461583 + ... + 51461620.

It is an arithmetic number, because the mean of its divisors is an integer number (514616020).

Almost surely, 2^1955540857 is an apocalyptic number.

It is an amenable number.

1955540857 is a deficient number, since it is larger than the sum of its proper divisors (102923223).

1955540857 is a wasteful number, since it uses less digits than its factorization.

1955540857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102923222.

The product of its (nonzero) digits is 1260000, while the sum is 49.

The square root of 1955540857 is about 44221.4976792962. The cubic root of 1955540857 is about 1250.5151704770.

The spelling of 1955540857 in words is "one billion, nine hundred fifty-five million, five hundred forty thousand, eight hundred fifty-seven".