9997782541 has 2 divisors, whose sum is σ = 9997782542. Its totient is φ = 9997782540.

The previous prime is 9997782523. The next prime is 9997782563. The reversal of 9997782541 is 1452877999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9256364100 + 741418441 = 96210^2 + 27229^2 .

It is a cyclic number.

It is not a de Polignac number, because 9997782541 - 2⁹ = 9997782029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9997782541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9997782521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4998891270 + 4998891271.

It is an arithmetic number, because the mean of its divisors is an integer number (4998891271).

Almost surely, 2^9997782541 is an apocalyptic number.

It is an amenable number.

9997782541 is a deficient number, since it is larger than the sum of its proper divisors (1).

9997782541 is an equidigital number, since it uses as much as digits as its factorization.

9997782541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11430720, while the sum is 61.

The square root of 9997782541 is about 99988.9120902913. The cubic root of 9997782541 is about 2154.2754325733.

The spelling of 9997782541 in words is "nine billion, nine hundred ninety-seven million, seven hundred eighty-two thousand, five hundred forty-one".