1267551251 has 2 divisors, whose sum is σ = 1267551252. Its totient is φ = 1267551250.

The previous prime is 1267551223. The next prime is 1267551253. The reversal of 1267551251 is 1521557621.

It is a strong prime.

It is an emirp because it is prime and its reverse (1521557621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1267551251 - 2²² = 1263356947 is a prime.

Together with 1267551253, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1267551253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633775625 + 633775626.

It is an arithmetic number, because the mean of its divisors is an integer number (633775626).

Almost surely, 2^1267551251 is an apocalyptic number.

1267551251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1267551251 is an equidigital number, since it uses as much as digits as its factorization.

1267551251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21000, while the sum is 35.

The square root of 1267551251 is about 35602.6860082213. The cubic root of 1267551251 is about 1082.2356669057.

The spelling of 1267551251 in words is "one billion, two hundred sixty-seven million, five hundred fifty-one thousand, two hundred fifty-one".