625153989 has 4 divisors (see below), whose sum is σ = 833538656. Its totient is φ = 416769324.

The previous prime is 625153987. The next prime is 625154009. The reversal of 625153989 is 989351526.

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 625153989 - 2¹ = 625153987 is a prime.

It is a super-2 number, since 2×625153989² = 781635019925224242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625153981) 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, 104192329 + ... + 104192334.

It is an arithmetic number, because the mean of its divisors is an integer number (208384664).

Almost surely, 2^625153989 is an apocalyptic number.

It is an amenable number.

625153989 is a deficient number, since it is larger than the sum of its proper divisors (208384667).

625153989 is a wasteful number, since it uses less digits than its factorization.

625153989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208384666.

The product of its digits is 583200, while the sum is 48.

The square root of 625153989 is about 25003.0795903225. The cubic root of 625153989 is about 855.0581855686.

The spelling of 625153989 in words is "six hundred twenty-five million, one hundred fifty-three thousand, nine hundred eighty-nine".