1625649109 has 8 divisors (see below), whose sum is σ = 1867222400. Its totient is φ = 1386410256.

The previous prime is 1625649097. The next prime is 1625649119. The reversal of 1625649109 is 9019465261.

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

It is a de Polignac number, because none of the positive numbers 2^k-1625649109 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 (1625649119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 582114 + ... + 584899.

It is an arithmetic number, because the mean of its divisors is an integer number (233402800).

Almost surely, 2^1625649109 is an apocalyptic number.

It is an amenable number.

1625649109 is a deficient number, since it is larger than the sum of its proper divisors (241573291).

1625649109 is a wasteful number, since it uses less digits than its factorization.

1625649109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1167219.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 1625649109 is about 40319.3391438897. The cubic root of 1625649109 is about 1175.8238637915.

The spelling of 1625649109 in words is "one billion, six hundred twenty-five million, six hundred forty-nine thousand, one hundred nine".