378812491 has 2 divisors, whose sum is σ = 378812492. Its totient is φ = 378812490.

The previous prime is 378812431. The next prime is 378812503. The reversal of 378812491 is 194218873.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-378812491 is a prime.

It is not a weakly prime, because it can be changed into another prime (378812431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189406245 + 189406246.

It is an arithmetic number, because the mean of its divisors is an integer number (189406246).

Almost surely, 2^378812491 is an apocalyptic number.

378812491 is a deficient number, since it is larger than the sum of its proper divisors (1).

378812491 is an equidigital number, since it uses as much as digits as its factorization.

378812491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 43.

The square root of 378812491 is about 19463.1058929452. The cubic root of 378812491 is about 723.5603558510.

The spelling of 378812491 in words is "three hundred seventy-eight million, eight hundred twelve thousand, four hundred ninety-one".