1625161 has 4 divisors (see below), whose sum is σ = 1629892. Its totient is φ = 1620432.

The previous prime is 1625153. The next prime is 1625167. The reversal of 1625161 is 1615261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1615261 = 89 ⋅18149.

It can be written as a sum of positive squares in 2 ways, for example, as 1394761 + 230400 = 1181^2 + 480^2 .

It is a cyclic number.

It is not a de Polignac number, because 1625161 - 2³ = 1625153 is a prime.

It is a super-2 number, since 2×1625161² = 5282296551842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1625167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1806 + ... + 2551.

It is an arithmetic number, because the mean of its divisors is an integer number (407473).

2^1625161 is an apocalyptic number.

It is an amenable number.

1625161 is a deficient number, since it is larger than the sum of its proper divisors (4731).

1625161 is an equidigital number, since it uses as much as digits as its factorization.

1625161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4730.

The product of its digits is 360, while the sum is 22.

The square root of 1625161 is about 1274.8180262296. The cubic root of 1625161 is about 117.5706169746.

The spelling of 1625161 in words is "one million, six hundred twenty-five thousand, one hundred sixty-one".