9778944151 has 2 divisors, whose sum is σ = 9778944152. Its totient is φ = 9778944150.

The previous prime is 9778944113. The next prime is 9778944179. The reversal of 9778944151 is 1514498779.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9778944151 - 2⁹ = 9778943639 is a prime.

It is a super-2 number, since 2×9778944151² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9778944092 and 9778944101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9778945151) by changing a digit.

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, 4889472075 + 4889472076.

It is an arithmetic number, because the mean of its divisors is an integer number (4889472076).

Almost surely, 2^9778944151 is an apocalyptic number.

9778944151 is a deficient number, since it is larger than the sum of its proper divisors (1).

9778944151 is an equidigital number, since it uses as much as digits as its factorization.

9778944151 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2540160, while the sum is 55.

The square root of 9778944151 is about 98888.5440837310. The cubic root of 9778944151 is about 2138.4412434836.

The spelling of 9778944151 in words is "nine billion, seven hundred seventy-eight million, nine hundred forty-four thousand, one hundred fifty-one".