1220251405 has 16 divisors (see below), whose sum is σ = 1481379840. Its totient is φ = 964864768.

The previous prime is 1220251387. The next prime is 1220251423. The reversal of 1220251405 is 5041520221.

It is an interprime number because it is at equal distance from previous prime (1220251387) and next prime (1220251423).

It is a cyclic number.

It is not a de Polignac number, because 1220251405 - 2²⁹ = 683380493 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213576 + ... + 219214.

It is an arithmetic number, because the mean of its divisors is an integer number (92586240).

Almost surely, 2^1220251405 is an apocalyptic number.

It is an amenable number.

1220251405 is a deficient number, since it is larger than the sum of its proper divisors (261128435).

1220251405 is a wasteful number, since it uses less digits than its factorization.

1220251405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6140.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 1220251405 is about 34932.0970598674. The cubic root of 1220251405 is about 1068.6031222982.

Adding to 1220251405 its reverse (5041520221), we get a palindrome (6261771626).

The spelling of 1220251405 in words is "one billion, two hundred twenty million, two hundred fifty-one thousand, four hundred five".