191361212256 has 24 divisors (see below), whose sum is σ = 502323182424. Its totient is φ = 63787070720.

The previous prime is 191361212227. The next prime is 191361212387. The reversal of 191361212256 is 652212163191.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×191361212256² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 996672885 + ... + 996673076.

It is an arithmetic number, because the mean of its divisors is an integer number (20930132601).

Almost surely, 2^191361212256 is an apocalyptic number.

191361212256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

191361212256 is an abundant number, since it is smaller than the sum of its proper divisors (310961970168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191361212256 is a wasteful number, since it uses less digits than its factorization.

191361212256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1993345974 (or 1993345966 counting only the distinct ones).

The product of its digits is 38880, while the sum is 39.

The spelling of 191361212256 in words is "one hundred ninety-one billion, three hundred sixty-one million, two hundred twelve thousand, two hundred fifty-six".