215111641 has 2 divisors, whose sum is σ = 215111642. Its totient is φ = 215111640.

The previous prime is 215111627. The next prime is 215111651. The reversal of 215111641 is 146111512.

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., 151191616 + 63920025 = 12296^2 + 7995^2 .

It is a cyclic number.

It is not a de Polignac number, because 215111641 - 2²¹ = 213014489 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (215111651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107555820 + 107555821.

It is an arithmetic number, because the mean of its divisors is an integer number (107555821).

Almost surely, 2^215111641 is an apocalyptic number.

It is an amenable number.

215111641 is a deficient number, since it is larger than the sum of its proper divisors (1).

215111641 is an equidigital number, since it uses as much as digits as its factorization.

215111641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 240, while the sum is 22.

The square root of 215111641 is about 14666.6847310495. The cubic root of 215111641 is about 599.1763151265.

The spelling of 215111641 in words is "two hundred fifteen million, one hundred eleven thousand, six hundred forty-one".