1254137861 has 2 divisors, whose sum is σ = 1254137862. Its totient is φ = 1254137860.

The previous prime is 1254137851. The next prime is 1254137939. The reversal of 1254137861 is 1687314521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1096007236 + 158130625 = 33106^2 + 12575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1254137861 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1254137831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627068930 + 627068931.

It is an arithmetic number, because the mean of its divisors is an integer number (627068931).

Almost surely, 2^1254137861 is an apocalyptic number.

It is an amenable number.

1254137861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1254137861 is an equidigital number, since it uses as much as digits as its factorization.

1254137861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 38.

The square root of 1254137861 is about 35413.8089027430. The cubic root of 1254137861 is about 1078.4046693534.

The spelling of 1254137861 in words is "one billion, two hundred fifty-four million, one hundred thirty-seven thousand, eight hundred sixty-one".