7481021987 has 2 divisors, whose sum is σ = 7481021988. Its totient is φ = 7481021986.

The previous prime is 7481021983. The next prime is 7481022037. The reversal of 7481021987 is 7891201847.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7481021987 - 2² = 7481021983 is a prime.

It is not a weakly prime, because it can be changed into another prime (7481021983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3740510993 + 3740510994.

It is an arithmetic number, because the mean of its divisors is an integer number (3740510994).

Almost surely, 2^7481021987 is an apocalyptic number.

7481021987 is a deficient number, since it is larger than the sum of its proper divisors (1).

7481021987 is an equidigital number, since it uses as much as digits as its factorization.

7481021987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 47.

The square root of 7481021987 is about 86492.9013676845. The cubic root of 7481021987 is about 1955.7813947218.

The spelling of 7481021987 in words is "seven billion, four hundred eighty-one million, twenty-one thousand, nine hundred eighty-seven".