1649971725 has 12 divisors (see below), whose sum is σ = 2727953376. Its totient is φ = 879984880.

The previous prime is 1649971721. The next prime is 1649971751. The reversal of 1649971725 is 5271799461.

It is not a de Polignac number, because 1649971725 - 2² = 1649971721 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649971721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10999737 + ... + 10999886.

It is an arithmetic number, because the mean of its divisors is an integer number (227329448).

Almost surely, 2^1649971725 is an apocalyptic number.

1649971725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1649971725 is a deficient number, since it is larger than the sum of its proper divisors (1077981651).

1649971725 is a wasteful number, since it uses less digits than its factorization.

1649971725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21999636 (or 21999631 counting only the distinct ones).

The product of its digits is 952560, while the sum is 51.

The square root of 1649971725 is about 40619.8439804980. The cubic root of 1649971725 is about 1181.6590006109.

The spelling of 1649971725 in words is "one billion, six hundred forty-nine million, nine hundred seventy-one thousand, seven hundred twenty-five".