1215215149 has 2 divisors, whose sum is σ = 1215215150. Its totient is φ = 1215215148.

The previous prime is 1215215147. The next prime is 1215215173. The reversal of 1215215149 is 9415125121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 647346249 + 567868900 = 25443^2 + 23830^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215215149 - 2¹ = 1215215147 is a prime.

Together with 1215215147, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1215215149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215215147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607607574 + 607607575.

It is an arithmetic number, because the mean of its divisors is an integer number (607607575).

Almost surely, 2^1215215149 is an apocalyptic number.

It is an amenable number.

1215215149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215215149 is an equidigital number, since it uses as much as digits as its factorization.

1215215149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 31.

The square root of 1215215149 is about 34859.9361588629. The cubic root of 1215215149 is about 1067.1309721595.

The spelling of 1215215149 in words is "one billion, two hundred fifteen million, two hundred fifteen thousand, one hundred forty-nine".