838781491 has 2 divisors, whose sum is σ = 838781492. Its totient is φ = 838781490.

The previous prime is 838781459. The next prime is 838781507. The reversal of 838781491 is 194187838.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 838781491 - 2⁵ = 838781459 is a prime.

It is not a weakly prime, because it can be changed into another prime (838781431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419390745 + 419390746.

It is an arithmetic number, because the mean of its divisors is an integer number (419390746).

Almost surely, 2^838781491 is an apocalyptic number.

838781491 is a deficient number, since it is larger than the sum of its proper divisors (1).

838781491 is an equidigital number, since it uses as much as digits as its factorization.

838781491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 49.

The square root of 838781491 is about 28961.7245860809. The cubic root of 838781491 is about 943.0823409486.

The spelling of 838781491 in words is "eight hundred thirty-eight million, seven hundred eighty-one thousand, four hundred ninety-one".