215134649 has 2 divisors, whose sum is σ = 215134650. Its totient is φ = 215134648.

The previous prime is 215134639. The next prime is 215134657. The reversal of 215134649 is 946431512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157678249 + 57456400 = 12557^2 + 7580^2 .

It is a cyclic number.

It is not a de Polignac number, because 215134649 - 2⁸ = 215134393 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (215134639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107567324 + 107567325.

It is an arithmetic number, because the mean of its divisors is an integer number (107567325).

Almost surely, 2^215134649 is an apocalyptic number.

It is an amenable number.

215134649 is a deficient number, since it is larger than the sum of its proper divisors (1).

215134649 is an equidigital number, since it uses as much as digits as its factorization.

215134649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 35.

The square root of 215134649 is about 14667.4690727473. The cubic root of 215134649 is about 599.1976766811.

It can be divided in two parts, 21513 and 4649, that added together give a palindrome (26162).

The spelling of 215134649 in words is "two hundred fifteen million, one hundred thirty-four thousand, six hundred forty-nine".