96991421 has 2 divisors, whose sum is σ = 96991422. Its totient is φ = 96991420.

The previous prime is 96991351. The next prime is 96991423. The reversal of 96991421 is 12419969.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96727225 + 264196 = 9835^2 + 514^2 .

It is an emirp because it is prime and its reverse (12419969) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 96991421 - 2¹⁸ = 96729277 is a prime.

Together with 96991423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (96991423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48495710 + 48495711.

It is an arithmetic number, because the mean of its divisors is an integer number (48495711).

Almost surely, 2^96991421 is an apocalyptic number.

It is an amenable number.

96991421 is a deficient number, since it is larger than the sum of its proper divisors (1).

96991421 is an equidigital number, since it uses as much as digits as its factorization.

96991421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 41.

The square root of 96991421 is about 9848.4222594282. The cubic root of 96991421 is about 459.4565431379.

The spelling of 96991421 in words is "ninety-six million, nine hundred ninety-one thousand, four hundred twenty-one".