99778351 has 2 divisors, whose sum is σ = 99778352. Its totient is φ = 99778350.

The previous prime is 99778339. The next prime is 99778363. The reversal of 99778351 is 15387799.

It is a balanced prime because it is at equal distance from previous prime (99778339) and next prime (99778363).

It is a cyclic number.

It is not a de Polignac number, because 99778351 - 2⁷ = 99778223 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 99778295 and 99778304.

It is a congruent number.

It is a weakly prime.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49889175 + 49889176.

It is an arithmetic number, because the mean of its divisors is an integer number (49889176).

Almost surely, 2^99778351 is an apocalyptic number.

99778351 is a deficient number, since it is larger than the sum of its proper divisors (1).

99778351 is an equidigital number, since it uses as much as digits as its factorization.

99778351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 476280, while the sum is 49.

The square root of 99778351 is about 9988.9114021499. The cubic root of 99778351 is about 463.8156951707.

The spelling of 99778351 in words is "ninety-nine million, seven hundred seventy-eight thousand, three hundred fifty-one".