421251525 has 18 divisors (see below), whose sum is σ = 754508690. Its totient is φ = 224667360.

The previous prime is 421251497. The next prime is 421251533. The reversal of 421251525 is 525152124.

It can be written as a sum of positive squares in 3 ways, for example, as 89756676 + 331494849 = 9474^2 + 18207^2 .

It is not a de Polignac number, because 421251525 - 2¹⁸ = 420989381 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 935890 + ... + 936339.

Almost surely, 2^421251525 is an apocalyptic number.

421251525 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

421251525 is a deficient number, since it is larger than the sum of its proper divisors (333257165).

421251525 is a wasteful number, since it uses less digits than its factorization.

421251525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1872245 (or 1872237 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 421251525 is about 20524.4129026874. The cubic root of 421251525 is about 749.6303511763.

The spelling of 421251525 in words is "four hundred twenty-one million, two hundred fifty-one thousand, five hundred twenty-five".