1154243002561 has 4 divisors (see below), whose sum is σ = 1259174184624. Its totient is φ = 1049311820500.

The previous prime is 1154243002543. The next prime is 1154243002573. The reversal of 1154243002561 is 1652003424511.

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 1154243002561 - 2¹⁷ = 1154242871489 is a prime.

It is a super-2 number, since 2×1154243002561² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1154243002511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52465591015 + ... + 52465591036.

It is an arithmetic number, because the mean of its divisors is an integer number (314793546156).

Almost surely, 2^{1154243002561} is an apocalyptic number.

1154243002561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1154243002561 is a deficient number, since it is larger than the sum of its proper divisors (104931182063).

1154243002561 is a wasteful number, since it uses less digits than its factorization.

1154243002561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104931182062.

The product of its (nonzero) digits is 28800, while the sum is 34.

The spelling of 1154243002561 in words is "one trillion, one hundred fifty-four billion, two hundred forty-three million, two thousand, five hundred sixty-one".