1861195061 has 16 divisors (see below), whose sum is σ = 2075328000. Its totient is φ = 1654844400.

The previous prime is 1861195057. The next prime is 1861195093. The reversal of 1861195061 is 1605911681.

It is not a de Polignac number, because 1861195061 - 2² = 1861195057 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 (1861195051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121946 + ... + 136356.

It is an arithmetic number, because the mean of its divisors is an integer number (129708000).

Almost surely, 2^1861195061 is an apocalyptic number.

1861195061 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1861195061 is a deficient number, since it is larger than the sum of its proper divisors (214132939).

1861195061 is a wasteful number, since it uses less digits than its factorization.

1861195061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14680.

The product of its (nonzero) digits is 12960, while the sum is 38.

The square root of 1861195061 is about 43141.5699876581. The cubic root of 1861195061 is about 1230.0722765822.

The spelling of 1861195061 in words is "one billion, eight hundred sixty-one million, one hundred ninety-five thousand, sixty-one".