1144731257 has 2 divisors, whose sum is σ = 1144731258. Its totient is φ = 1144731256.

The previous prime is 1144731223. The next prime is 1144731283. The reversal of 1144731257 is 7521374411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1143183721 + 1547536 = 33811^2 + 1244^2 .

It is a cyclic number.

It is not a de Polignac number, because 1144731257 - 2¹⁸ = 1144469113 is a prime.

It is not a weakly prime, because it can be changed into another prime (1144731557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572365628 + 572365629.

It is an arithmetic number, because the mean of its divisors is an integer number (572365629).

Almost surely, 2^1144731257 is an apocalyptic number.

It is an amenable number.

1144731257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1144731257 is an equidigital number, since it uses as much as digits as its factorization.

1144731257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23520, while the sum is 35.

The square root of 1144731257 is about 33833.8773568741. The cubic root of 1144731257 is about 1046.0871014263.

The spelling of 1144731257 in words is "one billion, one hundred forty-four million, seven hundred thirty-one thousand, two hundred fifty-seven".