625450081 has 9 divisors (see below), whose sum is σ = 634815673. Its totient is φ = 616221760.

The previous prime is 625450051. The next prime is 625450087. The reversal of 625450081 is 180054526.

The square root of 625450081 is 25009.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 14371681 + 611078400 = 3791^2 + 24720^2 .

It is not a de Polignac number, because 625450081 - 2⁷ = 625449953 is a prime.

It is a super-5 number, since 5×625450081⁵ (a number of 45 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (625450087) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2225661 + ... + 2225941.

Almost surely, 2^625450081 is an apocalyptic number.

625450081 is the 25009-th square number.

625450081 is the 12505-th centered octagonal number.

It is an amenable number.

625450081 is a deficient number, since it is larger than the sum of its proper divisors (9365592).

625450081 is an frugal number, since it uses more digits than its factorization.

625450081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740 (or 370 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The cubic root of 625450081 is about 855.1931581421.

The spelling of 625450081 in words is "six hundred twenty-five million, four hundred fifty thousand, eighty-one".