1227978013 has 2 divisors, whose sum is σ = 1227978014. Its totient is φ = 1227978012.

The previous prime is 1227977969. The next prime is 1227978061. The reversal of 1227978013 is 3108797221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1225910169 + 2067844 = 35013^2 + 1438^2 .

It is a cyclic number.

It is not a de Polignac number, because 1227978013 - 2²¹ = 1225880861 is a prime.

It is a super-2 number, since 2×1227978013² = 3015860000822856338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1227978313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613989006 + 613989007.

It is an arithmetic number, because the mean of its divisors is an integer number (613989007).

Almost surely, 2^1227978013 is an apocalyptic number.

It is an amenable number.

1227978013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1227978013 is an equidigital number, since it uses as much as digits as its factorization.

1227978013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 1227978013 is about 35042.5172183735. The cubic root of 1227978013 is about 1070.8538364834.

The spelling of 1227978013 in words is "one billion, two hundred twenty-seven million, nine hundred seventy-eight thousand, thirteen".