5431021987 has 2 divisors, whose sum is σ = 5431021988. Its totient is φ = 5431021986.

The previous prime is 5431021979. The next prime is 5431022017. The reversal of 5431021987 is 7891201345.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5431021987 - 2³ = 5431021979 is a prime.

It is not a weakly prime, because it can be changed into another prime (5431028987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2715510993 + 2715510994.

It is an arithmetic number, because the mean of its divisors is an integer number (2715510994).

Almost surely, 2^5431021987 is an apocalyptic number.

5431021987 is a deficient number, since it is larger than the sum of its proper divisors (1).

5431021987 is an equidigital number, since it uses as much as digits as its factorization.

5431021987 is an odious number, because the sum of its binary digits is odd.

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

The square root of 5431021987 is about 73695.4678864311. The cubic root of 5431021987 is about 1757.7638166600.

The spelling of 5431021987 in words is "five billion, four hundred thirty-one million, twenty-one thousand, nine hundred eighty-seven".