7998009001 has 2 divisors, whose sum is σ = 7998009002. Its totient is φ = 7998009000.

The previous prime is 7998008981. The next prime is 7998009049. The reversal of 7998009001 is 1009008997.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7996651776 + 1357225 = 89424^2 + 1165^2 .

It is a cyclic number.

It is not a de Polignac number, because 7998009001 - 2⁵ = 7998008969 is a prime.

It is not a weakly prime, because it can be changed into another prime (7998009301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3999004500 + 3999004501.

It is an arithmetic number, because the mean of its divisors is an integer number (3999004501).

Almost surely, 2^7998009001 is an apocalyptic number.

It is an amenable number.

7998009001 is a deficient number, since it is larger than the sum of its proper divisors (1).

7998009001 is an equidigital number, since it uses as much as digits as its factorization.

7998009001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 7998009001 is about 89431.5883846418. The cubic root of 7998009001 is about 1999.8340696506.

The spelling of 7998009001 in words is "seven billion, nine hundred ninety-eight million, nine thousand, one".