1556229947 has 2 divisors, whose sum is σ = 1556229948. Its totient is φ = 1556229946.

The previous prime is 1556229943. The next prime is 1556229967. The reversal of 1556229947 is 7499226551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1556229947 - 2² = 1556229943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1556229895 and 1556229904.

It is not a weakly prime, because it can be changed into another prime (1556229943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778114973 + 778114974.

It is an arithmetic number, because the mean of its divisors is an integer number (778114974).

Almost surely, 2^1556229947 is an apocalyptic number.

1556229947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1556229947 is an equidigital number, since it uses as much as digits as its factorization.

1556229947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1360800, while the sum is 50.

The square root of 1556229947 is about 39449.0804328821. The cubic root of 1556229947 is about 1158.8429671487.

The spelling of 1556229947 in words is "one billion, five hundred fifty-six million, two hundred twenty-nine thousand, nine hundred forty-seven".