2331493721 has 2 divisors, whose sum is σ = 2331493722. Its totient is φ = 2331493720.

The previous prime is 2331493699. The next prime is 2331493757. The reversal of 2331493721 is 1273941332.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1919403721 + 412090000 = 43811^2 + 20300^2 .

It is a cyclic number.

It is not a de Polignac number, because 2331493721 - 2¹⁰ = 2331492697 is a prime.

It is not a weakly prime, because it can be changed into another prime (2331493771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1165746860 + 1165746861.

It is an arithmetic number, because the mean of its divisors is an integer number (1165746861).

Almost surely, 2^2331493721 is an apocalyptic number.

It is an amenable number.

2331493721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2331493721 is an equidigital number, since it uses as much as digits as its factorization.

2331493721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 35.

The square root of 2331493721 is about 48285.5436026146. The cubic root of 2331493721 is about 1326.0037432394.

The spelling of 2331493721 in words is "two billion, three hundred thirty-one million, four hundred ninety-three thousand, seven hundred twenty-one".