215530739 has 2 divisors, whose sum is σ = 215530740. Its totient is φ = 215530738.

The previous prime is 215530681. The next prime is 215530753. The reversal of 215530739 is 937035512.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215530739 - 2¹⁶ = 215465203 is a prime.

It is a super-2 number, since 2×215530739² = 92906998907772242, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 215530699 and 215530708.

It is not a weakly prime, because it can be changed into another prime (215530339) 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, 107765369 + 107765370.

It is an arithmetic number, because the mean of its divisors is an integer number (107765370).

Almost surely, 2^215530739 is an apocalyptic number.

215530739 is a deficient number, since it is larger than the sum of its proper divisors (1).

215530739 is an equidigital number, since it uses as much as digits as its factorization.

215530739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28350, while the sum is 35.

The square root of 215530739 is about 14680.9651930655. The cubic root of 215530739 is about 599.5651840420.

The spelling of 215530739 in words is "two hundred fifteen million, five hundred thirty thousand, seven hundred thirty-nine".