2113981951 has 2 divisors, whose sum is σ = 2113981952. Its totient is φ = 2113981950.

The previous prime is 2113981937. The next prime is 2113981963. The reversal of 2113981951 is 1591893112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2113981951 - 2⁷ = 2113981823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2113988951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056990975 + 1056990976.

It is an arithmetic number, because the mean of its divisors is an integer number (1056990976).

Almost surely, 2^2113981951 is an apocalyptic number.

2113981951 is a deficient number, since it is larger than the sum of its proper divisors (1).

2113981951 is an equidigital number, since it uses as much as digits as its factorization.

2113981951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 40.

The square root of 2113981951 is about 45978.0594523083. The cubic root of 2113981951 is about 1283.4149433831.

It can be divided in two parts, 2113 and 981951, that added together give a square (984064 = 992²).

The spelling of 2113981951 in words is "two billion, one hundred thirteen million, nine hundred eighty-one thousand, nine hundred fifty-one".