1936191861 has 12 divisors (see below), whose sum is σ = 2799271488. Its totient is φ = 1289617704.

The previous prime is 1936191853. The next prime is 1936191923. The reversal of 1936191861 is 1681916391.

1936191861 is a `hidden beast` number, since 19 + 3 + 619 + 18 + 6 + 1 = 666.

It is not a de Polignac number, because 1936191861 - 2³ = 1936191853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1936191811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87595 + ... + 107448.

It is an arithmetic number, because the mean of its divisors is an integer number (233272624).

Almost surely, 2^1936191861 is an apocalyptic number.

It is an amenable number.

1936191861 is a deficient number, since it is larger than the sum of its proper divisors (863079627).

1936191861 is a wasteful number, since it uses less digits than its factorization.

1936191861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196152 (or 196149 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 1936191861 is about 44002.1801846227. The cubic root of 1936191861 is about 1246.3771068740.

The spelling of 1936191861 in words is "one billion, nine hundred thirty-six million, one hundred ninety-one thousand, eight hundred sixty-one".