7581109423 has 2 divisors, whose sum is σ = 7581109424. Its totient is φ = 7581109422.

The previous prime is 7581109381. The next prime is 7581109451. The reversal of 7581109423 is 3249011857.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7581109423 - 2²¹ = 7579012271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7581109483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3790554711 + 3790554712.

It is an arithmetic number, because the mean of its divisors is an integer number (3790554712).

Almost surely, 2^7581109423 is an apocalyptic number.

7581109423 is a deficient number, since it is larger than the sum of its proper divisors (1).

7581109423 is an equidigital number, since it uses as much as digits as its factorization.

7581109423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 7581109423 is about 87069.5665717936. The cubic root of 7581109423 is about 1964.4648166234.

The spelling of 7581109423 in words is "seven billion, five hundred eighty-one million, one hundred nine thousand, four hundred twenty-three".