9198376381 has 2 divisors, whose sum is σ = 9198376382. Its totient is φ = 9198376380.

The previous prime is 9198376367. The next prime is 9198376399. The reversal of 9198376381 is 1836738919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7029984025 + 2168392356 = 83845^2 + 46566^2 .

It is an emirp because it is prime and its reverse (1836738919) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9198376381 - 2¹⁵ = 9198343613 is a prime.

It is a super-2 number, since 2×9198376381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9198376301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4599188190 + 4599188191.

It is an arithmetic number, because the mean of its divisors is an integer number (4599188191).

Almost surely, 2^9198376381 is an apocalyptic number.

It is an amenable number.

9198376381 is a deficient number, since it is larger than the sum of its proper divisors (1).

9198376381 is an equidigital number, since it uses as much as digits as its factorization.

9198376381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 55.

The square root of 9198376381 is about 95908.1663936914. The cubic root of 9198376381 is about 2095.2558346953.

The spelling of 9198376381 in words is "nine billion, one hundred ninety-eight million, three hundred seventy-six thousand, three hundred eighty-one".