8720942501 has 2 divisors, whose sum is σ = 8720942502. Its totient is φ = 8720942500.

The previous prime is 8720942497. The next prime is 8720942569. The reversal of 8720942501 is 1052490278.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7894322500 + 826620001 = 88850^2 + 28751^2 .

It is a cyclic number.

It is not a de Polignac number, because 8720942501 - 2² = 8720942497 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8720942201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4360471250 + 4360471251.

It is an arithmetic number, because the mean of its divisors is an integer number (4360471251).

Almost surely, 2^8720942501 is an apocalyptic number.

It is an amenable number.

8720942501 is a deficient number, since it is larger than the sum of its proper divisors (1).

8720942501 is an equidigital number, since it uses as much as digits as its factorization.

8720942501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 8720942501 is about 93385.9866414656. The cubic root of 8720942501 is about 2058.3590870314.

The spelling of 8720942501 in words is "eight billion, seven hundred twenty million, nine hundred forty-two thousand, five hundred one".