2931771989961 has 24 divisors (see below), whose sum is σ = 4307077008000. Its totient is φ = 1921190392800.

The previous prime is 2931771989959. The next prime is 2931771989981. The reversal of 2931771989961 is 1699891771392.

2931771989961 is a `hidden beast` number, since 293 + 1 + 7 + 7 + 198 + 99 + 61 = 666.

It is not a de Polignac number, because 2931771989961 - 2¹ = 2931771989959 is a prime.

It is a super-2 number, since 2×2931771989961² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2931771989961.

It is not an unprimeable number, because it can be changed into a prime (2931771989981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 958305 + ... + 2604206.

It is an arithmetic number, because the mean of its divisors is an integer number (179461542000).

Almost surely, 2^{2931771989961} is an apocalyptic number.

It is an amenable number.

2931771989961 is a deficient number, since it is larger than the sum of its proper divisors (1375305018039).

2931771989961 is a wasteful number, since it uses less digits than its factorization.

2931771989961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3564077 (or 3564074 counting only the distinct ones).

The product of its digits is 92588832, while the sum is 72.

The spelling of 2931771989961 in words is "two trillion, nine hundred thirty-one billion, seven hundred seventy-one million, nine hundred eighty-nine thousand, nine hundred sixty-one".