1257267361 has 16 divisors (see below), whose sum is σ = 1468661760. Its totient is φ = 1054060560.

The previous prime is 1257267329. The next prime is 1257267379. The reversal of 1257267361 is 1637627521.

It is not a de Polignac number, because 1257267361 - 2⁵ = 1257267329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1257267761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53160 + ... + 73078.

It is an arithmetic number, because the mean of its divisors is an integer number (91791360).

Almost surely, 2^1257267361 is an apocalyptic number.

It is an amenable number.

1257267361 is a deficient number, since it is larger than the sum of its proper divisors (211394399).

1257267361 is a wasteful number, since it uses less digits than its factorization.

1257267361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20124.

The product of its digits is 105840, while the sum is 40.

The square root of 1257267361 is about 35457.9661148239. The cubic root of 1257267361 is about 1079.3009196131.

The spelling of 1257267361 in words is "one billion, two hundred fifty-seven million, two hundred sixty-seven thousand, three hundred sixty-one".