5181621307 has 2 divisors, whose sum is σ = 5181621308. Its totient is φ = 5181621306.

The previous prime is 5181621259. The next prime is 5181621311. The reversal of 5181621307 is 7031261815.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5181621307 - 2¹¹ = 5181619259 is a prime.

It is not a weakly prime, because it can be changed into another prime (5181621337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2590810653 + 2590810654.

It is an arithmetic number, because the mean of its divisors is an integer number (2590810654).

Almost surely, 2^5181621307 is an apocalyptic number.

5181621307 is a deficient number, since it is larger than the sum of its proper divisors (1).

5181621307 is an equidigital number, since it uses as much as digits as its factorization.

5181621307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 5181621307 is about 71983.4794032631. The cubic root of 5181621307 is about 1730.4347317597.

The spelling of 5181621307 in words is "five billion, one hundred eighty-one million, six hundred twenty-one thousand, three hundred seven".