1556161041 has 4 divisors (see below), whose sum is σ = 2074881392. Its totient is φ = 1037440692.

The previous prime is 1556161021. The next prime is 1556161043. The reversal of 1556161041 is 1401616551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1401616551 = 3 ⋅467205517.

It is not a de Polignac number, because 1556161041 - 2¹¹ = 1556158993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1556161043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259360171 + ... + 259360176.

It is an arithmetic number, because the mean of its divisors is an integer number (518720348).

Almost surely, 2^1556161041 is an apocalyptic number.

It is an amenable number.

1556161041 is a deficient number, since it is larger than the sum of its proper divisors (518720351).

1556161041 is an equidigital number, since it uses as much as digits as its factorization.

1556161041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518720350.

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 1556161041 is about 39448.2070695235. The cubic root of 1556161041 is about 1158.8258633327.

Adding to 1556161041 its reverse (1401616551), we get a palindrome (2957777592).

The spelling of 1556161041 in words is "one billion, five hundred fifty-six million, one hundred sixty-one thousand, forty-one".