7997000261 has 2 divisors, whose sum is σ = 7997000262. Its totient is φ = 7997000260.

The previous prime is 7997000257. The next prime is 7997000339. The reversal of 7997000261 is 1620007997.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7640508100 + 356492161 = 87410^2 + 18881^2 .

It is an emirp because it is prime and its reverse (1620007997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7997000261 - 2² = 7997000257 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7997000251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3998500130 + 3998500131.

It is an arithmetic number, because the mean of its divisors is an integer number (3998500131).

Almost surely, 2^7997000261 is an apocalyptic number.

It is an amenable number.

7997000261 is a deficient number, since it is larger than the sum of its proper divisors (1).

7997000261 is an equidigital number, since it uses as much as digits as its factorization.

7997000261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47628, while the sum is 41.

The square root of 7997000261 is about 89425.9484769382. The cubic root of 7997000261 is about 1999.7499904989.

The spelling of 7997000261 in words is "seven billion, nine hundred ninety-seven million, two hundred sixty-one", and thus it is an aban number.