1154213257 has 2 divisors, whose sum is σ = 1154213258. Its totient is φ = 1154213256.

The previous prime is 1154213237. The next prime is 1154213299. The reversal of 1154213257 is 7523124511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 902641936 + 251571321 = 30044^2 + 15861^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1154213257 is a prime.

It is not a weakly prime, because it can be changed into another prime (1154213237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577106628 + 577106629.

It is an arithmetic number, because the mean of its divisors is an integer number (577106629).

Almost surely, 2^1154213257 is an apocalyptic number.

It is an amenable number.

1154213257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1154213257 is an equidigital number, since it uses as much as digits as its factorization.

1154213257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8400, while the sum is 31.

The square root of 1154213257 is about 33973.7142067216. The cubic root of 1154213257 is about 1048.9674678199.

Adding to 1154213257 its reverse (7523124511), we get a palindrome (8677337768).

The spelling of 1154213257 in words is "one billion, one hundred fifty-four million, two hundred thirteen thousand, two hundred fifty-seven".