1911111612861 has 16 divisors (see below), whose sum is σ = 2791429678080. Its totient is φ = 1153403225520.

The previous prime is 1911111612829. The next prime is 1911111612863. The reversal of 1911111612861 is 1682161111191.

It is not a de Polignac number, because 1911111612861 - 2⁵ = 1911111612829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1911111612863) 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, 121147915 + ... + 121163688.

It is an arithmetic number, because the mean of its divisors is an integer number (174464354880).

Almost surely, 2^{1911111612861} is an apocalyptic number.

1911111612861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1911111612861 is a deficient number, since it is larger than the sum of its proper divisors (880318065219).

1911111612861 is a wasteful number, since it uses less digits than its factorization.

1911111612861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242311856.

The product of its digits is 5184, while the sum is 39.

The spelling of 1911111612861 in words is "one trillion, nine hundred eleven billion, one hundred eleven million, six hundred twelve thousand, eight hundred sixty-one".