249143057 has 2 divisors, whose sum is σ = 249143058. Its totient is φ = 249143056.

The previous prime is 249143021. The next prime is 249143071. The reversal of 249143057 is 750341942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230098561 + 19044496 = 15169^2 + 4364^2 .

It is a cyclic number.

It is not a de Polignac number, because 249143057 - 2¹⁴ = 249126673 is a prime.

It is not a weakly prime, because it can be changed into another prime (249142057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124571528 + 124571529.

It is an arithmetic number, because the mean of its divisors is an integer number (124571529).

Almost surely, 2^249143057 is an apocalyptic number.

It is an amenable number.

249143057 is a deficient number, since it is larger than the sum of its proper divisors (1).

249143057 is an equidigital number, since it uses as much as digits as its factorization.

249143057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 249143057 is about 15784.2661216795. The cubic root of 249143057 is about 629.2399139396.

Adding to 249143057 its reverse (750341942), we get a palindrome (999484999).

The spelling of 249143057 in words is "two hundred forty-nine million, one hundred forty-three thousand, fifty-seven".