1220655731 has 4 divisors (see below), whose sum is σ = 1250427864. Its totient is φ = 1190883600.

The previous prime is 1220655707. The next prime is 1220655739. The reversal of 1220655731 is 1375560221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1220655731 - 2¹⁴ = 1220639347 is a prime.

It is a super-2 number, since 2×1220655731² = 2980000827246288722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220655739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14886005 + ... + 14886086.

It is an arithmetic number, because the mean of its divisors is an integer number (312606966).

Almost surely, 2^1220655731 is an apocalyptic number.

1220655731 is a deficient number, since it is larger than the sum of its proper divisors (29772133).

1220655731 is an equidigital number, since it uses as much as digits as its factorization.

1220655731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29772132.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 1220655731 is about 34937.8838941342. The cubic root of 1220655731 is about 1068.7211352235.

The spelling of 1220655731 in words is "one billion, two hundred twenty million, six hundred fifty-five thousand, seven hundred thirty-one".