1215125669 has 2 divisors, whose sum is σ = 1215125670. Its totient is φ = 1215125668.

The previous prime is 1215125617. The next prime is 1215125671. The reversal of 1215125669 is 9665215121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 958645444 + 256480225 = 30962^2 + 16015^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215125669 - 2⁸ = 1215125413 is a prime.

It is a super-2 number, since 2×1215125669² = 2953060782925395122, which contains 22 as substring.

Together with 1215125671, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215125689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607562834 + 607562835.

It is an arithmetic number, because the mean of its divisors is an integer number (607562835).

Almost surely, 2^1215125669 is an apocalyptic number.

It is an amenable number.

1215125669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215125669 is an equidigital number, since it uses as much as digits as its factorization.

1215125669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 38.

The square root of 1215125669 is about 34858.6527134942. The cubic root of 1215125669 is about 1067.1047794799.

The spelling of 1215125669 in words is "one billion, two hundred fifteen million, one hundred twenty-five thousand, six hundred sixty-nine".