1254117649 has 2 divisors, whose sum is σ = 1254117650. Its totient is φ = 1254117648.

The previous prime is 1254117647. The next prime is 1254117671. The reversal of 1254117649 is 9467114521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 998117649 + 256000000 = 31593^2 + 16000^2 .

It is a cyclic number.

It is not a de Polignac number, because 1254117649 - 2¹ = 1254117647 is a prime.

It is a super-2 number, since 2×1254117649² = 3145622155066574402, which contains 22 as substring.

Together with 1254117647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1254117647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627058824 + 627058825.

It is an arithmetic number, because the mean of its divisors is an integer number (627058825).

Almost surely, 2^1254117649 is an apocalyptic number.

It is an amenable number.

1254117649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1254117649 is an equidigital number, since it uses as much as digits as its factorization.

1254117649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 40.

The square root of 1254117649 is about 35413.5235326845. The cubic root of 1254117649 is about 1078.3988760423.

The spelling of 1254117649 in words is "one billion, two hundred fifty-four million, one hundred seventeen thousand, six hundred forty-nine".