215438477249 has 2 divisors, whose sum is σ = 215438477250. Its totient is φ = 215438477248.

The previous prime is 215438477231. The next prime is 215438477263. The reversal of 215438477249 is 942774834512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178871476624 + 36567000625 = 422932^2 + 191225^2 .

It is a cyclic number.

It is not a de Polignac number, because 215438477249 - 2²⁰ = 215437428673 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 215438477194 and 215438477203.

It is not a weakly prime, because it can be changed into another prime (215438477209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107719238624 + 107719238625.

It is an arithmetic number, because the mean of its divisors is an integer number (107719238625).

Almost surely, 2^215438477249 is an apocalyptic number.

It is an amenable number.

215438477249 is a deficient number, since it is larger than the sum of its proper divisors (1).

215438477249 is an equidigital number, since it uses as much as digits as its factorization.

215438477249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13547520, while the sum is 56.

The spelling of 215438477249 in words is "two hundred fifteen billion, four hundred thirty-eight million, four hundred seventy-seven thousand, two hundred forty-nine".