9997776251 has 2 divisors, whose sum is σ = 9997776252. Its totient is φ = 9997776250.

The previous prime is 9997776233. The next prime is 9997776259. The reversal of 9997776251 is 1526777999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9997776251 - 2¹⁴ = 9997759867 is a prime.

It is not a weakly prime, because it can be changed into another prime (9997776259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4998888125 + 4998888126.

It is an arithmetic number, because the mean of its divisors is an integer number (4998888126).

Almost surely, 2^9997776251 is an apocalyptic number.

9997776251 is a deficient number, since it is larger than the sum of its proper divisors (1).

9997776251 is an equidigital number, since it uses as much as digits as its factorization.

9997776251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15002820, while the sum is 62.

The square root of 9997776251 is about 99988.8806367988. The cubic root of 9997776251 is about 2154.2749807933.

The spelling of 9997776251 in words is "nine billion, nine hundred ninety-seven million, seven hundred seventy-six thousand, two hundred fifty-one".