1263731401 has 9 divisors (see below), whose sum is σ = 1334457453. Its totient is φ = 1196579340.

The previous prime is 1263731387. The next prime is 1263731419. The reversal of 1263731401 is 1041373621.

The square root of 1263731401 is 35549.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1263731401 - 2⁵ = 1263731369 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1263731401.

It is not an unprimeable number, because it can be changed into a prime (1263731101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 674496 + ... + 676366.

Almost surely, 2^1263731401 is an apocalyptic number.

1263731401 is the 35549-th square number.

1263731401 is the 17775-th centered octagonal number.

It is an amenable number.

1263731401 is a deficient number, since it is larger than the sum of its proper divisors (70726052).

1263731401 is an frugal number, since it uses more digits than its factorization.

1263731401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3780 (or 1890 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The cubic root of 1263731401 is about 1081.1474433072.

The spelling of 1263731401 in words is "one billion, two hundred sixty-three million, seven hundred thirty-one thousand, four hundred one".