1154728649 has 8 divisors (see below), whose sum is σ = 1177043400. Its totient is φ = 1132433536.

The previous prime is 1154728637. The next prime is 1154728697. The reversal of 1154728649 is 9468274511.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 32947600 + 1121781049 = 5740^2 + 33493^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1154728649 - 2¹² = 1154724553 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1154721649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179639 + ... + 185955.

It is an arithmetic number, because the mean of its divisors is an integer number (147130425).

Almost surely, 2^1154728649 is an apocalyptic number.

It is an amenable number.

1154728649 is a deficient number, since it is larger than the sum of its proper divisors (22314751).

1154728649 is an equidigital number, since it uses as much as digits as its factorization.

1154728649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9819.

The product of its digits is 483840, while the sum is 47.

The square root of 1154728649 is about 33981.2985184498. The cubic root of 1154728649 is about 1049.1235767505.

The spelling of 1154728649 in words is "one billion, one hundred fifty-four million, seven hundred twenty-eight thousand, six hundred forty-nine".