1631925 has 18 divisors (see below), whose sum is σ = 2923362. Its totient is φ = 870240.

The previous prime is 1631921. The next prime is 1631939. The reversal of 1631925 is 5291361.

1631925 is a `hidden beast` number, since 1 + 631 + 9 + 25 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 213444 + 1418481 = 462^2 + 1191^2 .

It is not a de Polignac number, because 1631925 - 2² = 1631921 is a prime.

It is a Curzon number.

1631925 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631921) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3402 + ... + 3851.

It is an arithmetic number, because the mean of its divisors is an integer number (162409).

2^1631925 is an apocalyptic number.

1631925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1631925 is a deficient number, since it is larger than the sum of its proper divisors (1291437).

1631925 is a wasteful number, since it uses less digits than its factorization.

1631925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7269 (or 7261 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 1631925 is about 1277.4681992128. The cubic root of 1631925 is about 117.7335027667.

It can be divided in two parts, 1631 and 925, that added together give a triangular number (2556 = T₇₁).

The spelling of 1631925 in words is "one million, six hundred thirty-one thousand, nine hundred twenty-five".