1267388461 has 2 divisors, whose sum is σ = 1267388462. Its totient is φ = 1267388460.

The previous prime is 1267388449. The next prime is 1267388467. The reversal of 1267388461 is 1648837621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1266932836 + 455625 = 35594^2 + 675^2 .

It is an emirp because it is prime and its reverse (1648837621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1267388461 - 2⁵ = 1267388429 is a prime.

It is a super-2 number, since 2×1267388461² = 3212547022151897042, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1267388467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633694230 + 633694231.

It is an arithmetic number, because the mean of its divisors is an integer number (633694231).

Almost surely, 2^1267388461 is an apocalyptic number.

It is an amenable number.

1267388461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1267388461 is an equidigital number, since it uses as much as digits as its factorization.

1267388461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 46.

The square root of 1267388461 is about 35600.3997309019. The cubic root of 1267388461 is about 1082.1893348707.

The spelling of 1267388461 in words is "one billion, two hundred sixty-seven million, three hundred eighty-eight thousand, four hundred sixty-one".