625075721 has 4 divisors (see below), whose sum is σ = 625181700. Its totient is φ = 624969744.

The previous prime is 625075687. The next prime is 625075727. The reversal of 625075721 is 127570526.

It is a happy number.

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 450967696 + 174108025 = 21236^2 + 13195^2 .

It is a cyclic number.

It is not a de Polignac number, because 625075721 - 2¹⁸ = 624813577 is a prime.

It is a super-3 number, since 3×625075721³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (625075727) 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, 43586 + ... + 56123.

It is an arithmetic number, because the mean of its divisors is an integer number (156295425).

Almost surely, 2^625075721 is an apocalyptic number.

It is an amenable number.

625075721 is a deficient number, since it is larger than the sum of its proper divisors (105979).

625075721 is an equidigital number, since it uses as much as digits as its factorization.

625075721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105978.

The product of its (nonzero) digits is 29400, while the sum is 35.

The square root of 625075721 is about 25001.5143741334. The cubic root of 625075721 is about 855.0225002343.

The spelling of 625075721 in words is "six hundred twenty-five million, seventy-five thousand, seven hundred twenty-one".