9967951291 has 2 divisors, whose sum is σ = 9967951292. Its totient is φ = 9967951290.

The previous prime is 9967951229. The next prime is 9967951297. The reversal of 9967951291 is 1921597699.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9967951291 - 2³¹ = 7820467643 is a prime.

It is not a weakly prime, because it can be changed into another prime (9967951297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4983975645 + 4983975646.

It is an arithmetic number, because the mean of its divisors is an integer number (4983975646).

Almost surely, 2^9967951291 is an apocalyptic number.

9967951291 is a deficient number, since it is larger than the sum of its proper divisors (1).

9967951291 is an equidigital number, since it uses as much as digits as its factorization.

9967951291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2755620, while the sum is 58.

The square root of 9967951291 is about 99839.6278588818. The cubic root of 9967951291 is about 2152.1306652274.

The spelling of 9967951291 in words is "nine billion, nine hundred sixty-seven million, nine hundred fifty-one thousand, two hundred ninety-one".