1254718921 has 2 divisors, whose sum is σ = 1254718922. Its totient is φ = 1254718920.

The previous prime is 1254718853. The next prime is 1254718961. The reversal of 1254718921 is 1298174521.

It is an a-pointer prime, because the next prime (1254718961) can be obtained adding 1254718921 to its sum of digits (40).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 849139600 + 405579321 = 29140^2 + 20139^2 .

It is a cyclic number.

It is not a de Polignac number, because 1254718921 - 2¹¹ = 1254716873 is a prime.

It is not a weakly prime, because it can be changed into another prime (1254718961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627359460 + 627359461.

It is an arithmetic number, because the mean of its divisors is an integer number (627359461).

Almost surely, 2^1254718921 is an apocalyptic number.

It is an amenable number.

1254718921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1254718921 is an equidigital number, since it uses as much as digits as its factorization.

1254718921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 40.

The square root of 1254718921 is about 35422.0118146895. The cubic root of 1254718921 is about 1078.5711904055.

The spelling of 1254718921 in words is "one billion, two hundred fifty-four million, seven hundred eighteen thousand, nine hundred twenty-one".