1226978947 has 2 divisors, whose sum is σ = 1226978948. Its totient is φ = 1226978946.

The previous prime is 1226978939. The next prime is 1226978969. The reversal of 1226978947 is 7498796221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1226978947 - 2³ = 1226978939 is a prime.

It is not a weakly prime, because it can be changed into another prime (1226978147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613489473 + 613489474.

It is an arithmetic number, because the mean of its divisors is an integer number (613489474).

Almost surely, 2^1226978947 is an apocalyptic number.

1226978947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1226978947 is an equidigital number, since it uses as much as digits as its factorization.

1226978947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 55.

The square root of 1226978947 is about 35028.2592630579. The cubic root of 1226978947 is about 1070.5633470451.

The spelling of 1226978947 in words is "one billion, two hundred twenty-six million, nine hundred seventy-eight thousand, nine hundred forty-seven".