1220000031 has 12 divisors (see below), whose sum is σ = 1763077680. Its totient is φ = 812938560.

The previous prime is 1220000027. The next prime is 1220000039. The reversal of 1220000031 is 1300000221.

It is a happy number.

It is not a de Polignac number, because 1220000031 - 2² = 1220000027 is a prime.

It is a super-2 number, since 2×1220000031² = 2976800151280001922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1219999968 and 1220000022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220000039) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12675 + ... + 50996.

It is an arithmetic number, because the mean of its divisors is an integer number (146923140).

Almost surely, 2^1220000031 is an apocalyptic number.

1220000031 is a deficient number, since it is larger than the sum of its proper divisors (543077649).

1220000031 is a wasteful number, since it uses less digits than its factorization.

1220000031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65806 (or 65803 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 1220000031 is about 34928.4988369097. The cubic root of 1220000031 is about 1068.5297391993.

Adding to 1220000031 its reverse (1300000221), we get a palindrome (2520000252).

The spelling of 1220000031 in words is "one billion, two hundred twenty million, thirty-one", and thus it is an aban number.