1215532979 has 2 divisors, whose sum is σ = 1215532980. Its totient is φ = 1215532978.

The previous prime is 1215532939. The next prime is 1215533009. The reversal of 1215532979 is 9792355121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1215532979 - 2¹⁶ = 1215467443 is a prime.

It is a super-2 number, since 2×1215532979² = 2955040846073228882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1215532919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607766489 + 607766490.

It is an arithmetic number, because the mean of its divisors is an integer number (607766490).

Almost surely, 2^1215532979 is an apocalyptic number.

1215532979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215532979 is an equidigital number, since it uses as much as digits as its factorization.

1215532979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 170100, while the sum is 44.

The square root of 1215532979 is about 34864.4945324036. The cubic root of 1215532979 is about 1067.2239972980.

The spelling of 1215532979 in words is "one billion, two hundred fifteen million, five hundred thirty-two thousand, nine hundred seventy-nine".