1625406841 has 4 divisors (see below), whose sum is σ = 1625499252. Its totient is φ = 1625314432.

The previous prime is 1625406773. The next prime is 1625406857. The reversal of 1625406841 is 1486045261.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1486045261 = 173 ⋅8589857.

It can be written as a sum of positive squares in 2 ways, for example, as 1325251216 + 300155625 = 36404^2 + 17325^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1625406841 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1625406841.

It is not an unprimeable number, because it can be changed into a prime (1625446841) 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 in 3 ways as a sum of consecutive naturals, for example, 10756 + ... + 58021.

It is an arithmetic number, because the mean of its divisors is an integer number (406374813).

Almost surely, 2^1625406841 is an apocalyptic number.

It is an amenable number.

1625406841 is a deficient number, since it is larger than the sum of its proper divisors (92411).

1625406841 is an equidigital number, since it uses as much as digits as its factorization.

1625406841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92410.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 1625406841 is about 40316.3346672289. The cubic root of 1625406841 is about 1175.7654504791.

The spelling of 1625406841 in words is "one billion, six hundred twenty-five million, four hundred six thousand, eight hundred forty-one".