137821925 has 6 divisors (see below), whose sum is σ = 170899218. Its totient is φ = 110257520.

The previous prime is 137821847. The next prime is 137821933. The reversal of 137821925 is 529128731.

It can be written as a sum of positive squares in 3 ways, for example, as 23203489 + 114618436 = 4817^2 + 10706^2 .

It is not a de Polignac number, because 137821925 - 2²⁶ = 70713061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2756414 + ... + 2756463.

It is an arithmetic number, because the mean of its divisors is an integer number (28483203).

Almost surely, 2^137821925 is an apocalyptic number.

It is an amenable number.

137821925 is a deficient number, since it is larger than the sum of its proper divisors (33077293).

137821925 is an equidigital number, since it uses as much as digits as its factorization.

137821925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5512887 (or 5512882 counting only the distinct ones).

The product of its digits is 30240, while the sum is 38.

The square root of 137821925 is about 11739.7583024524. The cubic root of 137821925 is about 516.5425519887.

The spelling of 137821925 in words is "one hundred thirty-seven million, eight hundred twenty-one thousand, nine hundred twenty-five".