1263131945 has 8 divisors (see below), whose sum is σ = 1516137480. Its totient is φ = 1010252800.

The previous prime is 1263131939. The next prime is 1263131953. The reversal of 1263131945 is 5491313621.

It can be written as a sum of positive squares in 4 ways, for example, as 119880601 + 1143251344 = 10949^2 + 33812^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1263131945 - 2¹² = 1263127849 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8006 + ... + 50895.

It is an arithmetic number, because the mean of its divisors is an integer number (189517185).

Almost surely, 2^1263131945 is an apocalyptic number.

It is an amenable number.

1263131945 is a deficient number, since it is larger than the sum of its proper divisors (253005535).

1263131945 is an equidigital number, since it uses as much as digits as its factorization.

1263131945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63195.

The product of its digits is 19440, while the sum is 35.

The square root of 1263131945 is about 35540.5675953550. The cubic root of 1263131945 is about 1080.9764674114.

The spelling of 1263131945 in words is "one billion, two hundred sixty-three million, one hundred thirty-one thousand, nine hundred forty-five".