27219961 has 2 divisors, whose sum is σ = 27219962. Its totient is φ = 27219960.

The previous prime is 27219943. The next prime is 27219967. The reversal of 27219961 is 16991272.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20748025 + 6471936 = 4555^2 + 2544^2 .

It is a cyclic number.

It is not a de Polignac number, because 27219961 - 2²¹ = 25122809 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27219961.

It is not a weakly prime, because it can be changed into another prime (27219967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13609980 + 13609981.

It is an arithmetic number, because the mean of its divisors is an integer number (13609981).

Almost surely, 2^27219961 is an apocalyptic number.

It is an amenable number.

27219961 is a deficient number, since it is larger than the sum of its proper divisors (1).

27219961 is an equidigital number, since it uses as much as digits as its factorization.

27219961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 37.

The square root of 27219961 is about 5217.2752467164. The cubic root of 27219961 is about 300.8124680363.

The spelling of 27219961 in words is "twenty-seven million, two hundred nineteen thousand, nine hundred sixty-one".