1451878891 has 2 divisors, whose sum is σ = 1451878892. Its totient is φ = 1451878890.

The previous prime is 1451878861. The next prime is 1451878913. The reversal of 1451878891 is 1988781541.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1451878891 - 2¹¹ = 1451876843 is a prime.

It is not a weakly prime, because it can be changed into another prime (1451878861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 725939445 + 725939446.

It is an arithmetic number, because the mean of its divisors is an integer number (725939446).

Almost surely, 2^1451878891 is an apocalyptic number.

1451878891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1451878891 is an equidigital number, since it uses as much as digits as its factorization.

1451878891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 645120, while the sum is 52.

The square root of 1451878891 is about 38103.5285898826. The cubic root of 1451878891 is about 1132.3398642699.

The spelling of 1451878891 in words is "one billion, four hundred fifty-one million, eight hundred seventy-eight thousand, eight hundred ninety-one".