2991925 has 6 divisors (see below), whose sum is σ = 3710018. Its totient is φ = 2393520.

The previous prime is 2991917. The next prime is 2991929. The reversal of 2991925 is 5291992.

It can be written as a sum of positive squares in 3 ways, for example, as 40401 + 2951524 = 201^2 + 1718^2 .

It is not a de Polignac number, because 2991925 - 2³ = 2991917 is a prime.

It is a Duffinian number.

2991925 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2991929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 59814 + ... + 59863.

2^2991925 is an apocalyptic number.

2991925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2991925 is a deficient number, since it is larger than the sum of its proper divisors (718093).

2991925 is a wasteful number, since it uses less digits than its factorization.

2991925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119687 (or 119682 counting only the distinct ones).

The product of its digits is 14580, while the sum is 37.

The square root of 2991925 is about 1729.7181851388. The cubic root of 2991925 is about 144.0954389182.

It can be divided in two parts, 2991 and 925, that added together give a triangular number (3916 = T₈₈).

The spelling of 2991925 in words is "two million, nine hundred ninety-one thousand, nine hundred twenty-five".