123921025 has 12 divisors (see below), whose sum is σ = 153826092. Its totient is φ = 99031040.

The previous prime is 123921023. The next prime is 123921047. The reversal of 123921025 is 520129321.

123921025 = 7871² + 7872².

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 23580736 + 100340289 = 4856^2 + 10017^2 .

It is not a de Polignac number, because 123921025 - 2¹ = 123921023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123921023) 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, 28389 + ... + 32461.

It is an arithmetic number, because the mean of its divisors is an integer number (12818841).

Almost surely, 2^123921025 is an apocalyptic number.

123921025 is the 7872-nd centered square number.

It is an amenable number.

123921025 is a deficient number, since it is larger than the sum of its proper divisors (29905067).

123921025 is a wasteful number, since it uses less digits than its factorization.

123921025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5300 (or 5295 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 123921025 is about 11131.9820786776. The cubic root of 123921025 is about 498.5572073700.

The spelling of 123921025 in words is "one hundred twenty-three million, nine hundred twenty-one thousand, twenty-five".