1000220731 has 2 divisors, whose sum is σ = 1000220732. Its totient is φ = 1000220730.

The previous prime is 1000220723. The next prime is 1000220747. The reversal of 1000220731 is 1370220001.

It is a happy number.

It is an a-pointer prime, because the next prime (1000220747) can be obtained adding 1000220731 to its sum of digits (16).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1000220731 - 2³ = 1000220723 is a prime.

It is a super-2 number, since 2×1000220731² = 2000883021444348722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1000227731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500110365 + 500110366.

It is an arithmetic number, because the mean of its divisors is an integer number (500110366).

Almost surely, 2^1000220731 is an apocalyptic number.

1000220731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000220731 is an equidigital number, since it uses as much as digits as its factorization.

1000220731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 1000220731 is about 31626.2664726648. The cubic root of 1000220731 is about 1000.0735715871.

Adding to 1000220731 its reverse (1370220001), we get a palindrome (2370440732).

The spelling of 1000220731 in words is "one billion, two hundred twenty thousand, seven hundred thirty-one".