1925618649 has 24 divisors (see below), whose sum is σ = 2618021856. Its totient is φ = 1258857600.

The previous prime is 1925618633. The next prime is 1925618671. The reversal of 1925618649 is 9468165291.

It is not a de Polignac number, because 1925618649 - 2⁴ = 1925618633 is a prime.

It is a super-3 number, since 3×1925618649³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1925618689) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5817414 + ... + 5817744.

It is an arithmetic number, because the mean of its divisors is an integer number (109084244).

Almost surely, 2^1925618649 is an apocalyptic number.

It is an amenable number.

1925618649 is a deficient number, since it is larger than the sum of its proper divisors (692403207).

1925618649 is a wasteful number, since it uses less digits than its factorization.

1925618649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709 (or 578 counting only the distinct ones).

The product of its digits is 933120, while the sum is 51.

The square root of 1925618649 is about 43881.8715302800. The cubic root of 1925618649 is about 1244.1042139391.

The spelling of 1925618649 in words is "one billion, nine hundred twenty-five million, six hundred eighteen thousand, six hundred forty-nine".