1286945231 has 16 divisors (see below), whose sum is σ = 1524451488. Its totient is φ = 1079939520.

The previous prime is 1286945213. The next prime is 1286945239. The reversal of 1286945231 is 1325496821.

It is not a de Polignac number, because 1286945231 - 2⁶ = 1286945167 is a prime.

It is a super-2 number, since 2×1286945231² = 3312456055187286722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1286945239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19886 + ... + 54491.

It is an arithmetic number, because the mean of its divisors is an integer number (95278218).

Almost surely, 2^1286945231 is an apocalyptic number.

1286945231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1286945231 is a deficient number, since it is larger than the sum of its proper divisors (237506257).

1286945231 is an equidigital number, since it uses as much as digits as its factorization.

1286945231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74423 (or 74401 counting only the distinct ones).

The product of its digits is 103680, while the sum is 41.

The square root of 1286945231 is about 35874.0188855389. The cubic root of 1286945231 is about 1087.7272823236.

The spelling of 1286945231 in words is "one billion, two hundred eighty-six million, nine hundred forty-five thousand, two hundred thirty-one".