1201980279591 has 160 divisors (see below), whose sum is σ = 2255588375040. Its totient is φ = 621013941504.

The previous prime is 1201980279587. The next prime is 1201980279683. The reversal of 1201980279591 is 1959720891021.

It is a happy number.

1201980279591 is a `hidden beast` number, since 1 + 20 + 1 + 9 + 8 + 0 + 27 + 9 + 591 = 666.

It is not a de Polignac number, because 1201980279591 - 2² = 1201980279587 is a prime.

It is a super-2 number, since 2×1201980279591² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201980279191) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 88393605 + ... + 88407201.

It is an arithmetic number, because the mean of its divisors is an integer number (14097427344).

Almost surely, 2^{1201980279591} is an apocalyptic number.

1201980279591 is a deficient number, since it is larger than the sum of its proper divisors (1053608095449).

1201980279591 is a wasteful number, since it uses less digits than its factorization.

1201980279591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13875 (or 13866 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 54.

The spelling of 1201980279591 in words is "one trillion, two hundred one billion, nine hundred eighty million, two hundred seventy-nine thousand, five hundred ninety-one".