1625261 has 8 divisors (see below), whose sum is σ = 1798848. Its totient is φ = 1456000.

The previous prime is 1625257. The next prime is 1625263.

1625261 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 4-Lehmer number, since φ(1625261) divides (1625261-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 1625261 - 2² = 1625257 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1625263) 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 7 ways as a sum of consecutive naturals, for example, 260 + ... + 1821.

It is an arithmetic number, because the mean of its divisors is an integer number (224856).

2^1625261 is an apocalyptic number.

1625261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1625261 is a deficient number, since it is larger than the sum of its proper divisors (173587).

1625261 is a wasteful number, since it uses less digits than its factorization.

1625261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2163.

The product of its digits is 720, while the sum is 23.

The square root of 1625261 is about 1274.8572469104. The cubic root of 1625261 is about 117.5730283912.

The spelling of 1625261 in words is "one million, six hundred twenty-five thousand, two hundred sixty-one".