1556622149 has 2 divisors, whose sum is σ = 1556622150. Its totient is φ = 1556622148.

The previous prime is 1556622131. The next prime is 1556622167. The reversal of 1556622149 is 9412266551.

It is a balanced prime because it is at equal distance from previous prime (1556622131) and next prime (1556622167).

It can be written as a sum of positive squares in only one way, i.e., 1488030625 + 68591524 = 38575^2 + 8282^2 .

It is an emirp because it is prime and its reverse (9412266551) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1556622149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1556625149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778311074 + 778311075.

It is an arithmetic number, because the mean of its divisors is an integer number (778311075).

Almost surely, 2^1556622149 is an apocalyptic number.

It is an amenable number.

1556622149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1556622149 is an equidigital number, since it uses as much as digits as its factorization.

1556622149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 41.

The square root of 1556622149 is about 39454.0511101205. The cubic root of 1556622149 is about 1158.9403097371.

The spelling of 1556622149 in words is "one billion, five hundred fifty-six million, six hundred twenty-two thousand, one hundred forty-nine".