1152747257 has 4 divisors (see below), whose sum is σ = 1155485796. Its totient is φ = 1150008720.

The previous prime is 1152747209. The next prime is 1152747287. The reversal of 1152747257 is 7527472511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 581967376 + 570779881 = 24124^2 + 23891^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1152747257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1152747287) 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, 1368638 + ... + 1369479.

It is an arithmetic number, because the mean of its divisors is an integer number (288871449).

Almost surely, 2^1152747257 is an apocalyptic number.

It is an amenable number.

1152747257 is a deficient number, since it is larger than the sum of its proper divisors (2738539).

1152747257 is an equidigital number, since it uses as much as digits as its factorization.

1152747257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2738538.

The product of its digits is 137200, while the sum is 41.

The square root of 1152747257 is about 33952.1318476469. The cubic root of 1152747257 is about 1048.5231715801.

The spelling of 1152747257 in words is "one billion, one hundred fifty-two million, seven hundred forty-seven thousand, two hundred fifty-seven".