1154687881 has 2 divisors, whose sum is σ = 1154687882. Its totient is φ = 1154687880.

The previous prime is 1154687861. The next prime is 1154687899. The reversal of 1154687881 is 1887864511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 765020281 + 389667600 = 27659^2 + 19740^2 .

It is a cyclic number.

It is not a de Polignac number, because 1154687881 - 2²⁵ = 1121133449 is a prime.

It is a super-2 number, since 2×1154687881² = 2666608205056540322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1154687861) 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, 577343940 + 577343941.

It is an arithmetic number, because the mean of its divisors is an integer number (577343941).

Almost surely, 2^1154687881 is an apocalyptic number.

It is an amenable number.

1154687881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1154687881 is an equidigital number, since it uses as much as digits as its factorization.

1154687881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 430080, while the sum is 49.

The square root of 1154687881 is about 33980.6986537946. The cubic root of 1154687881 is about 1049.1112300769. Note that the first 3 decimals are identical.

The spelling of 1154687881 in words is "one billion, one hundred fifty-four million, six hundred eighty-seven thousand, eight hundred eighty-one".