1220831590 has 32 divisors (see below), whose sum is σ = 2411163936. Its totient is φ = 441365760.

The previous prime is 1220831561. The next prime is 1220831593. The reversal of 1220831590 is 951380221.

1220831590 = 2570² + 2571² + ... + 2742².

It is a super-2 number, since 2×1220831590² = 2980859542283856200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220831593) 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 in 15 ways as a sum of consecutive naturals, for example, 13047 + ... + 51106.

It is an arithmetic number, because the mean of its divisors is an integer number (75348873).

Almost surely, 2^1220831590 is an apocalyptic number.

1220831590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1220831590 is a deficient number, since it is larger than the sum of its proper divisors (1190332346).

1220831590 is a wasteful number, since it uses less digits than its factorization.

1220831590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64344.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 1220831590 is about 34940.4005414935. The cubic root of 1220831590 is about 1068.7724560561.

The spelling of 1220831590 in words is "one billion, two hundred twenty million, eight hundred thirty-one thousand, five hundred ninety".