625161 has 4 divisors (see below), whose sum is σ = 833552. Its totient is φ = 416772.

The previous prime is 625133. The next prime is 625169. The reversal of 625161 is 161526.

It is a happy number.

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.

It is not a de Polignac number, because 625161 - 2⁵ = 625129 is a prime.

It is a D-number.

It is a Duffinian number.

625161 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (625169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104191 + ... + 104196.

It is an arithmetic number, because the mean of its divisors is an integer number (208388).

2⁶²⁵¹⁶¹ is an apocalyptic number.

It is an amenable number.

625161 is a deficient number, since it is larger than the sum of its proper divisors (208391).

625161 is a wasteful number, since it uses less digits than its factorization.

625161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208390.

The product of its digits is 360, while the sum is 21.

The square root of 625161 is about 790.6712338260. The cubic root of 625161 is about 85.5061382003.

Adding to 625161 its product of digits (360), we get a triangular number (625521 = T₁₁₁₈).

Adding to 625161 its reverse (161526), we get a palindrome (786687).

The spelling of 625161 in words is "six hundred twenty-five thousand, one hundred sixty-one".