1267431421 has 2 divisors, whose sum is σ = 1267431422. Its totient is φ = 1267431420.

The previous prime is 1267431409. The next prime is 1267431443. The reversal of 1267431421 is 1241347621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 704318521 + 563112900 = 26539^2 + 23730^2 .

It is a cyclic number.

It is not a de Polignac number, because 1267431421 - 2⁷ = 1267431293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1267231421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633715710 + 633715711.

It is an arithmetic number, because the mean of its divisors is an integer number (633715711).

Almost surely, 2^1267431421 is an apocalyptic number.

It is an amenable number.

1267431421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1267431421 is an equidigital number, since it uses as much as digits as its factorization.

1267431421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 31.

The square root of 1267431421 is about 35601.0030898007. The cubic root of 1267431421 is about 1082.2015622001.

It can be divided in two parts, 126743 and 1421, that added together give a square (128164 = 358²).

The spelling of 1267431421 in words is "one billion, two hundred sixty-seven million, four hundred thirty-one thousand, four hundred twenty-one".