1154262561 has 4 divisors (see below), whose sum is σ = 1539016752. Its totient is φ = 769508372.

The previous prime is 1154262547. The next prime is 1154262581. The reversal of 1154262561 is 1652624511.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1652624511 = 3 ⋅550874837.

It is a cyclic number.

It is not a de Polignac number, because 1154262561 - 2¹³ = 1154254369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1154262541) 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, 192377091 + ... + 192377096.

It is an arithmetic number, because the mean of its divisors is an integer number (384754188).

Almost surely, 2^1154262561 is an apocalyptic number.

It is an amenable number.

1154262561 is a deficient number, since it is larger than the sum of its proper divisors (384754191).

1154262561 is an equidigital number, since it uses as much as digits as its factorization.

1154262561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384754190.

The product of its digits is 14400, while the sum is 33.

The square root of 1154262561 is about 33974.4398187814. The cubic root of 1154262561 is about 1048.9824036951.

The spelling of 1154262561 in words is "one billion, one hundred fifty-four million, two hundred sixty-two thousand, five hundred sixty-one".