1055195861 has 4 divisors (see below), whose sum is σ = 1055961324. Its totient is φ = 1054430400.

The previous prime is 1055195857. The next prime is 1055195881. The reversal of 1055195861 is 1685915501.

1055195861 = 22969² + 22970².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 527620900 + 527574961 = 22970^2 + 22969^2 .

It is a cyclic number.

It is not a de Polignac number, because 1055195861 - 2² = 1055195857 is a prime.

It is a super-2 number, since 2×1055195861² = 2226876610143062642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1055195851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380660 + ... + 383421.

It is an arithmetic number, because the mean of its divisors is an integer number (263990331).

Almost surely, 2^1055195861 is an apocalyptic number.

1055195861 is the 22970-th centered square number.

It is an amenable number.

1055195861 is a deficient number, since it is larger than the sum of its proper divisors (765463).

1055195861 is an equidigital number, since it uses as much as digits as its factorization.

1055195861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765462.

The product of its (nonzero) digits is 54000, while the sum is 41.

The square root of 1055195861 is about 32483.7784286250. The cubic root of 1055195861 is about 1018.0701241381.

The spelling of 1055195861 in words is "one billion, fifty-five million, one hundred ninety-five thousand, eight hundred sixty-one".