1154497861 has 4 divisors (see below), whose sum is σ = 1259452224. Its totient is φ = 1049543500.

The previous prime is 1154497777. The next prime is 1154497871. The reversal of 1154497861 is 1687944511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1154497861 - 2⁷ = 1154497733 is a prime.

It is a super-2 number, since 2×1154497861² = 2665730622107150642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1154497871) 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 in 3 ways as a sum of consecutive naturals, for example, 52477165 + ... + 52477186.

It is an arithmetic number, because the mean of its divisors is an integer number (314863056).

Almost surely, 2^1154497861 is an apocalyptic number.

1154497861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1154497861 is a deficient number, since it is larger than the sum of its proper divisors (104954363).

1154497861 is a wasteful number, since it uses less digits than its factorization.

1154497861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104954362.

The product of its digits is 241920, while the sum is 46.

The square root of 1154497861 is about 33977.9025397390. The cubic root of 1154497861 is about 1049.0536782901.

The spelling of 1154497861 in words is "one billion, one hundred fifty-four million, four hundred ninety-seven thousand, eight hundred sixty-one".