1267545641 has 2 divisors, whose sum is σ = 1267545642. Its totient is φ = 1267545640.

The previous prime is 1267545563. The next prime is 1267545691. The reversal of 1267545641 is 1465457621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 746382400 + 521163241 = 27320^2 + 22829^2 .

It is an emirp because it is prime and its reverse (1465457621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1267545641 is a prime.

It is not a weakly prime, because it can be changed into another prime (1267545691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633772820 + 633772821.

It is an arithmetic number, because the mean of its divisors is an integer number (633772821).

Almost surely, 2^1267545641 is an apocalyptic number.

It is an amenable number.

1267545641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1267545641 is an equidigital number, since it uses as much as digits as its factorization.

1267545641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 41.

The square root of 1267545641 is about 35602.6072219437. The cubic root of 1267545641 is about 1082.2340702968.

The spelling of 1267545641 in words is "one billion, two hundred sixty-seven million, five hundred forty-five thousand, six hundred forty-one".