1285367257 has 2 divisors, whose sum is σ = 1285367258. Its totient is φ = 1285367256.

The previous prime is 1285367201. The next prime is 1285367269. The reversal of 1285367257 is 7527635821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 684921241 + 600446016 = 26171^2 + 24504^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285367257 - 2¹⁵ = 1285334489 is a prime.

It is not a weakly prime, because it can be changed into another prime (1285367357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642683628 + 642683629.

It is an arithmetic number, because the mean of its divisors is an integer number (642683629).

Almost surely, 2^1285367257 is an apocalyptic number.

It is an amenable number.

1285367257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285367257 is an equidigital number, since it uses as much as digits as its factorization.

1285367257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 705600, while the sum is 46.

The square root of 1285367257 is about 35852.0188692352. The cubic root of 1285367257 is about 1087.2825321444.

The spelling of 1285367257 in words is "one billion, two hundred eighty-five million, three hundred sixty-seven thousand, two hundred fifty-seven".