2220731 has 2 divisors, whose sum is σ = 2220732. Its totient is φ = 2220730.

The previous prime is 2220697. The next prime is 2220749. The reversal of 2220731 is 1370222.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2220731 is a prime.

It is a super-2 number, since 2×2220731² = 9863292348722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2220331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110365 + 1110366.

It is an arithmetic number, because the mean of its divisors is an integer number (1110366).

2^2220731 is an apocalyptic number.

2220731 is a deficient number, since it is larger than the sum of its proper divisors (1).

2220731 is an equidigital number, since it uses as much as digits as its factorization.

2220731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 2220731 is about 1490.2117299230. The cubic root of 2220731 is about 130.4663918192.

Adding to 2220731 its reverse (1370222), we get a palindrome (3590953).

The spelling of 2220731 in words is "two million, two hundred twenty thousand, seven hundred thirty-one".