1215615061 has 2 divisors, whose sum is σ = 1215615062. Its totient is φ = 1215615060.

The previous prime is 1215615029. The next prime is 1215615083. The reversal of 1215615061 is 1605165121.

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., 961372036 + 254243025 = 31006^2 + 15945^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215615061 - 2⁵ = 1215615029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215615091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607807530 + 607807531.

It is an arithmetic number, because the mean of its divisors is an integer number (607807531).

Almost surely, 2^1215615061 is an apocalyptic number.

It is an amenable number.

1215615061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215615061 is an equidigital number, since it uses as much as digits as its factorization.

1215615061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 1215615061 is about 34865.6716699965. The cubic root of 1215615061 is about 1067.2480191084.

The spelling of 1215615061 in words is "one billion, two hundred fifteen million, six hundred fifteen thousand, sixty-one".