1320554981 has 2 divisors, whose sum is σ = 1320554982. Its totient is φ = 1320554980.

The previous prime is 1320554971. The next prime is 1320554987. The reversal of 1320554981 is 1894550231.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1172446081 + 148108900 = 34241^2 + 12170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1320554981 is a prime.

It is a super-2 number, since 2×1320554981² = 3487730915687820722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320554987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660277490 + 660277491.

It is an arithmetic number, because the mean of its divisors is an integer number (660277491).

Almost surely, 2^1320554981 is an apocalyptic number.

It is an amenable number.

1320554981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320554981 is an equidigital number, since it uses as much as digits as its factorization.

1320554981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 1320554981 is about 36339.4411211840. The cubic root of 1320554981 is about 1097.1150244726.

It can be divided in two parts, 13205 and 54981, that added together give a palindrome (68186).

The spelling of 1320554981 in words is "one billion, three hundred twenty million, five hundred fifty-four thousand, nine hundred eighty-one".