1254720109 has 2 divisors, whose sum is σ = 1254720110. Its totient is φ = 1254720108.

The previous prime is 1254720097. The next prime is 1254720113. The reversal of 1254720109 is 9010274521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1254718084 + 2025 = 35422^2 + 45^2 .

It is a cyclic number.

It is not a de Polignac number, because 1254720109 - 2¹¹ = 1254718061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1254720179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627360054 + 627360055.

It is an arithmetic number, because the mean of its divisors is an integer number (627360055).

Almost surely, 2^1254720109 is an apocalyptic number.

It is an amenable number.

1254720109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1254720109 is an equidigital number, since it uses as much as digits as its factorization.

1254720109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 1254720109 is about 35422.0285839194. The cubic root of 1254720109 is about 1078.5715308117.

The spelling of 1254720109 in words is "one billion, two hundred fifty-four million, seven hundred twenty thousand, one hundred nine".