73970521 has 4 divisors (see below), whose sum is σ = 74460544. Its totient is φ = 73480500.

The previous prime is 73970509. The next prime is 73970539. The reversal of 73970521 is 12507937.

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 a de Polignac number, because none of the positive numbers 2^k-73970521 is a prime.

It is a super-2 number, since 2×73970521² = 10943275954022882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73970581) 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, 244785 + ... + 245086.

It is an arithmetic number, because the mean of its divisors is an integer number (18615136).

Almost surely, 2^73970521 is an apocalyptic number.

It is an amenable number.

73970521 is a deficient number, since it is larger than the sum of its proper divisors (490023).

73970521 is a wasteful number, since it uses less digits than its factorization.

73970521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490022.

The product of its (nonzero) digits is 13230, while the sum is 34.

The square root of 73970521 is about 8600.6116642946. The cubic root of 73970521 is about 419.7778889853. Note that the first 3 decimals are identical.

The spelling of 73970521 in words is "seventy-three million, nine hundred seventy thousand, five hundred twenty-one".