2219731 has 2 divisors, whose sum is σ = 2219732. Its totient is φ = 2219730.

The previous prime is 2219683. The next prime is 2219771. The reversal of 2219731 is 1379122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2219731 - 2²¹ = 122579 is a prime.

It is a super-2 number, since 2×2219731² = 9854411424722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2219696 and 2219705.

It is not a weakly prime, because it can be changed into another prime (2219771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1109865 + 1109866.

It is an arithmetic number, because the mean of its divisors is an integer number (1109866).

2^2219731 is an apocalyptic number.

2219731 is a deficient number, since it is larger than the sum of its proper divisors (1).

2219731 is an equidigital number, since it uses as much as digits as its factorization.

2219731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 25.

The square root of 2219731 is about 1489.8761693510. The cubic root of 2219731 is about 130.4468057790.

The spelling of 2219731 in words is "two million, two hundred nineteen thousand, seven hundred thirty-one".