1625870401 has 4 divisors (see below), whose sum is σ = 1629625732. Its totient is φ = 1622115072.

The previous prime is 1625870371. The next prime is 1625870419. The reversal of 1625870401 is 1040785261.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 935442225 + 690428176 = 30585^2 + 26276^2 .

It is a cyclic number.

It is not a de Polignac number, because 1625870401 - 2¹⁹ = 1625346113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1625870431) 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, 1877016 + ... + 1877881.

It is an arithmetic number, because the mean of its divisors is an integer number (407406433).

Almost surely, 2^1625870401 is an apocalyptic number.

It is an amenable number.

1625870401 is a deficient number, since it is larger than the sum of its proper divisors (3755331).

1625870401 is an equidigital number, since it uses as much as digits as its factorization.

1625870401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3755330.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 1625870401 is about 40322.0832919134. The cubic root of 1625870401 is about 1175.8772145028.

The spelling of 1625870401 in words is "one billion, six hundred twenty-five million, eight hundred seventy thousand, four hundred one".