1249726069 has 2 divisors, whose sum is σ = 1249726070. Its totient is φ = 1249726068.

The previous prime is 1249726063. The next prime is 1249726109. The reversal of 1249726069 is 9606279421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1189353169 + 60372900 = 34487^2 + 7770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1249726069 is a prime.

It is a super-2 number, since 2×1249726069² = 3123630495076385522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1249726063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624863034 + 624863035.

It is an arithmetic number, because the mean of its divisors is an integer number (624863035).

Almost surely, 2^1249726069 is an apocalyptic number.

It is an amenable number.

1249726069 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249726069 is an equidigital number, since it uses as much as digits as its factorization.

1249726069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 1249726069 is about 35351.4648777105. The cubic root of 1249726069 is about 1077.1386504073.

The spelling of 1249726069 in words is "one billion, two hundred forty-nine million, seven hundred twenty-six thousand, sixty-nine".