4125521 has 2 divisors, whose sum is σ = 4125522. Its totient is φ = 4125520.

The previous prime is 4125497. The next prime is 4125551. The reversal of 4125521 is 1255214.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2265025 + 1860496 = 1505^2 + 1364^2 .

It is a cyclic number.

It is not a de Polignac number, because 4125521 - 2¹⁴ = 4109137 is a prime.

It is a Chen prime.

It is equal to p₂₉₁₄₂₂ and since 4125521 and 291422 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 4125493 and 4125502.

It is not a weakly prime, because it can be changed into another prime (4125551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2062760 + 2062761.

It is an arithmetic number, because the mean of its divisors is an integer number (2062761).

Almost surely, 2^4125521 is an apocalyptic number.

It is an amenable number.

4125521 is a deficient number, since it is larger than the sum of its proper divisors (1).

4125521 is an equidigital number, since it uses as much as digits as its factorization.

4125521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 400, while the sum is 20.

The square root of 4125521 is about 2031.1378584429. The cubic root of 4125521 is about 160.3834682373.

The spelling of 4125521 in words is "four million, one hundred twenty-five thousand, five hundred twenty-one".