70037521 has 4 divisors (see below), whose sum is σ = 70151652. Its totient is φ = 69923392.

The previous prime is 70037519. The next prime is 70037531. The reversal of 70037521 is 12573007.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12573007 = 37 ⋅339811.

It can be written as a sum of positive squares in 2 ways, for example, as 25000000 + 45037521 = 5000^2 + 6711^2 .

It is a cyclic number.

It is not a de Polignac number, because 70037521 - 2¹ = 70037519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70037531) 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, 56140 + ... + 57373.

It is an arithmetic number, because the mean of its divisors is an integer number (17537913).

Almost surely, 2^70037521 is an apocalyptic number.

It is an amenable number.

70037521 is a deficient number, since it is larger than the sum of its proper divisors (114131).

70037521 is a wasteful number, since it uses less digits than its factorization.

70037521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114130.

The product of its (nonzero) digits is 1470, while the sum is 25.

The square root of 70037521 is about 8368.8422735764. The cubic root of 70037521 is about 412.2021524214.

The spelling of 70037521 in words is "seventy million, thirty-seven thousand, five hundred twenty-one".