1267055401 has 2 divisors, whose sum is σ = 1267055402. Its totient is φ = 1267055400.

The previous prime is 1267055399. The next prime is 1267055437. The reversal of 1267055401 is 1045507621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 779749776 + 487305625 = 27924^2 + 22075^2 .

It is a cyclic number.

It is not a de Polignac number, because 1267055401 - 2¹ = 1267055399 is a prime.

Together with 1267055399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1267055701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633527700 + 633527701.

It is an arithmetic number, because the mean of its divisors is an integer number (633527701).

Almost surely, 2^1267055401 is an apocalyptic number.

It is an amenable number.

1267055401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1267055401 is an equidigital number, since it uses as much as digits as its factorization.

1267055401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 1267055401 is about 35595.7216670768. The cubic root of 1267055401 is about 1082.0945295371.

The spelling of 1267055401 in words is "one billion, two hundred sixty-seven million, fifty-five thousand, four hundred one".