1225054981 has 2 divisors, whose sum is σ = 1225054982. Its totient is φ = 1225054980.

The previous prime is 1225054927. The next prime is 1225055063. The reversal of 1225054981 is 1894505221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 800324100 + 424730881 = 28290^2 + 20609^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225054981 - 2¹³ = 1225046789 is a prime.

It is a super-2 number, since 2×1225054981² = 3001519412945820722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1225054981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225054381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612527490 + 612527491.

It is an arithmetic number, because the mean of its divisors is an integer number (612527491).

Almost surely, 2^1225054981 is an apocalyptic number.

It is an amenable number.

1225054981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225054981 is an equidigital number, since it uses as much as digits as its factorization.

1225054981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 1225054981 is about 35000.7854340442. The cubic root of 1225054981 is about 1070.0034882118.

The spelling of 1225054981 in words is "one billion, two hundred twenty-five million, fifty-four thousand, nine hundred eighty-one".