70323521 has 4 divisors (see below), whose sum is σ = 72748500. Its totient is φ = 67898544.

The previous prime is 70323511. The next prime is 70323553. The reversal of 70323521 is 12532307.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53217025 + 17106496 = 7295^2 + 4136^2 .

It is a cyclic number.

It is not a de Polignac number, because 70323521 - 2²⁶ = 3214657 is a prime.

It is a super-3 number, since 3×70323521³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70323511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1212446 + ... + 1212503.

It is an arithmetic number, because the mean of its divisors is an integer number (18187125).

Almost surely, 2^70323521 is an apocalyptic number.

It is an amenable number.

70323521 is a deficient number, since it is larger than the sum of its proper divisors (2424979).

70323521 is a wasteful number, since it uses less digits than its factorization.

70323521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2424978.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 70323521 is about 8385.9120553462. The cubic root of 70323521 is about 412.7624697498.

Adding to 70323521 its reverse (12532307), we get a palindrome (82855828).

The spelling of 70323521 in words is "seventy million, three hundred twenty-three thousand, five hundred twenty-one".