1154221531 has 4 divisors (see below), whose sum is σ = 1154294712. Its totient is φ = 1154148352.

The previous prime is 1154221499. The next prime is 1154221553. The reversal of 1154221531 is 1351224511.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1154221531 - 2⁵ = 1154221499 is a prime.

It is a super-2 number, since 2×1154221531² = 2664454685247967922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1154221496 and 1154221505.

It is not an unprimeable number, because it can be changed into a prime (1154221561) 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, 2086 + ... + 48091.

It is an arithmetic number, because the mean of its divisors is an integer number (288573678).

Almost surely, 2^1154221531 is an apocalyptic number.

1154221531 is a deficient number, since it is larger than the sum of its proper divisors (73181).

1154221531 is an equidigital number, since it uses as much as digits as its factorization.

1154221531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73180.

The product of its digits is 1200, while the sum is 25.

The square root of 1154221531 is about 33973.8359771163. The cubic root of 1154221531 is about 1048.9699743284.

The spelling of 1154221531 in words is "one billion, one hundred fifty-four million, two hundred twenty-one thousand, five hundred thirty-one".