1247650969 has 2 divisors, whose sum is σ = 1247650970. Its totient is φ = 1247650968.

The previous prime is 1247650931. The next prime is 1247650973. The reversal of 1247650969 is 9690567421.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1238195344 + 9455625 = 35188^2 + 3075^2 .

It is a cyclic number.

It is not a de Polignac number, because 1247650969 - 2²⁵ = 1214096537 is a prime.

It is a super-2 number, since 2×1247650969² = 3113265880893277922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1247650069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623825484 + 623825485.

It is an arithmetic number, because the mean of its divisors is an integer number (623825485).

Almost surely, 2^1247650969 is an apocalyptic number.

It is an amenable number.

1247650969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247650969 is an equidigital number, since it uses as much as digits as its factorization.

1247650969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 49.

The square root of 1247650969 is about 35322.1031225492. The cubic root of 1247650969 is about 1076.5421440378.

The spelling of 1247650969 in words is "one billion, two hundred forty-seven million, six hundred fifty thousand, nine hundred sixty-nine".