1255431563 has 4 divisors (see below), whose sum is σ = 1310015568. Its totient is φ = 1200847560.

The previous prime is 1255431539. The next prime is 1255431587. The reversal of 1255431563 is 3651345521.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1255431539) and next prime (1255431587).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1255431563 is a prime.

It is a super-2 number, since 2×1255431563² = 3152216818753245938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1255430563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27291968 + ... + 27292013.

It is an arithmetic number, because the mean of its divisors is an integer number (327503892).

Almost surely, 2^1255431563 is an apocalyptic number.

1255431563 is a deficient number, since it is larger than the sum of its proper divisors (54584005).

1255431563 is an equidigital number, since it uses as much as digits as its factorization.

1255431563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54584004.

The product of its digits is 54000, while the sum is 35.

The square root of 1255431563 is about 35432.0696968156. The cubic root of 1255431563 is about 1078.7753502491.

The spelling of 1255431563 in words is "one billion, two hundred fifty-five million, four hundred thirty-one thousand, five hundred sixty-three".