1878888491 has 2 divisors, whose sum is σ = 1878888492. Its totient is φ = 1878888490.

The previous prime is 1878888439. The next prime is 1878888499. The reversal of 1878888491 is 1948888781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1878888491 - 2²² = 1874694187 is a prime.

It is a super-2 number, since 2×1878888491² = 7060443923224514162, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1878888499) 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, 939444245 + 939444246.

It is an arithmetic number, because the mean of its divisors is an integer number (939444246).

Almost surely, 2^1878888491 is an apocalyptic number.

1878888491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1878888491 is an equidigital number, since it uses as much as digits as its factorization.

1878888491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8257536, while the sum is 62.

The square root of 1878888491 is about 43346.1473605210. The cubic root of 1878888491 is about 1233.9578790982.

The spelling of 1878888491 in words is "one billion, eight hundred seventy-eight million, eight hundred eighty-eight thousand, four hundred ninety-one".