70425521 has 4 divisors (see below), whose sum is σ = 72697344. Its totient is φ = 68153700.

The previous prime is 70425497. The next prime is 70425559. The reversal of 70425521 is 12552407.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 70425521 - 2¹⁸ = 70163377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (70425221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1135865 + ... + 1135926.

It is an arithmetic number, because the mean of its divisors is an integer number (18174336).

Almost surely, 2^70425521 is an apocalyptic number.

It is an amenable number.

70425521 is a deficient number, since it is larger than the sum of its proper divisors (2271823).

70425521 is a wasteful number, since it uses less digits than its factorization.

70425521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2271822.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 70425521 is about 8391.9914799766. The cubic root of 70425521 is about 412.9619356485.

Adding to 70425521 its reverse (12552407), we get a palindrome (82977928).

The spelling of 70425521 in words is "seventy million, four hundred twenty-five thousand, five hundred twenty-one".