1144505891 has 2 divisors, whose sum is σ = 1144505892. Its totient is φ = 1144505890.

The previous prime is 1144505863. The next prime is 1144505953. The reversal of 1144505891 is 1985054411.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1144505891 - 2⁶ = 1144505827 is a prime.

It is not a weakly prime, because it can be changed into another prime (1144505291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572252945 + 572252946.

It is an arithmetic number, because the mean of its divisors is an integer number (572252946).

Almost surely, 2^1144505891 is an apocalyptic number.

1144505891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1144505891 is an equidigital number, since it uses as much as digits as its factorization.

1144505891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 38.

The square root of 1144505891 is about 33830.5467144709. The cubic root of 1144505891 is about 1046.0184483583.

The spelling of 1144505891 in words is "one billion, one hundred forty-four million, five hundred five thousand, eight hundred ninety-one".