1253681669 has 2 divisors, whose sum is σ = 1253681670. Its totient is φ = 1253681668.

The previous prime is 1253681621. The next prime is 1253681707. The reversal of 1253681669 is 9661863521.

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., 1237984225 + 15697444 = 35185^2 + 3962^2 .

It is a cyclic number.

It is not a de Polignac number, because 1253681669 - 2⁸ = 1253681413 is a prime.

It is a super-2 number, since 2×1253681669² = 3143435454373251122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1253681069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626840834 + 626840835.

It is an arithmetic number, because the mean of its divisors is an integer number (626840835).

Almost surely, 2^1253681669 is an apocalyptic number.

It is an amenable number.

1253681669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1253681669 is an equidigital number, since it uses as much as digits as its factorization.

1253681669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 47.

The square root of 1253681669 is about 35407.3674395598. The cubic root of 1253681669 is about 1078.2738971153.

The spelling of 1253681669 in words is "one billion, two hundred fifty-three million, six hundred eighty-one thousand, six hundred sixty-nine".