1285745239 has 2 divisors, whose sum is σ = 1285745240. Its totient is φ = 1285745238.

The previous prime is 1285745213. The next prime is 1285745249. The reversal of 1285745239 is 9325475821.

It is a strong prime.

It is an emirp because it is prime and its reverse (9325475821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1285745239 is a prime.

It is a super-2 number, since 2×1285745239² = 3306281639222334242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285745249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642872619 + 642872620.

It is an arithmetic number, because the mean of its divisors is an integer number (642872620).

Almost surely, 2^1285745239 is an apocalyptic number.

1285745239 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285745239 is an equidigital number, since it uses as much as digits as its factorization.

1285745239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 46.

The square root of 1285745239 is about 35857.2899003815. The cubic root of 1285745239 is about 1087.3890990798.

The spelling of 1285745239 in words is "one billion, two hundred eighty-five million, seven hundred forty-five thousand, two hundred thirty-nine".