1221960931 has 2 divisors, whose sum is σ = 1221960932. Its totient is φ = 1221960930.

The previous prime is 1221960919. The next prime is 1221960947. The reversal of 1221960931 is 1390691221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221960931 - 2¹⁵ = 1221928163 is a prime.

It is a super-2 number, since 2×1221960931² = 2986377033780773522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221960991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610980465 + 610980466.

It is an arithmetic number, because the mean of its divisors is an integer number (610980466).

Almost surely, 2^1221960931 is an apocalyptic number.

1221960931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221960931 is an equidigital number, since it uses as much as digits as its factorization.

1221960931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 1221960931 is about 34956.5577681785. The cubic root of 1221960931 is about 1069.1019136080.

The spelling of 1221960931 in words is "one billion, two hundred twenty-one million, nine hundred sixty thousand, nine hundred thirty-one".