1215225149 has 2 divisors, whose sum is σ = 1215225150. Its totient is φ = 1215225148.

The previous prime is 1215225119. The next prime is 1215225173. The reversal of 1215225149 is 9415225121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 948948025 + 266277124 = 30805^2 + 16318^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215225149 - 2¹⁶ = 1215159613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215225119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607612574 + 607612575.

It is an arithmetic number, because the mean of its divisors is an integer number (607612575).

Almost surely, 2^1215225149 is an apocalyptic number.

It is an amenable number.

1215225149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215225149 is an equidigital number, since it uses as much as digits as its factorization.

1215225149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 32.

The square root of 1215225149 is about 34860.0795896969. The cubic root of 1215225149 is about 1067.1338992901.

The spelling of 1215225149 in words is "one billion, two hundred fifteen million, two hundred twenty-five thousand, one hundred forty-nine".