70913921 has 6 divisors (see below), whose sum is σ = 76788630. Its totient is φ = 65458848.

The previous prime is 70913897. The next prime is 70913933. The reversal of 70913921 is 12931907.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2686321 + 68227600 = 1639^2 + 8260^2 .

It is not a de Polignac number, because 70913921 - 2²⁶ = 3805057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70913951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 209636 + ... + 209973.

It is an arithmetic number, because the mean of its divisors is an integer number (12798105).

Almost surely, 2^70913921 is an apocalyptic number.

It is an amenable number.

70913921 is a deficient number, since it is larger than the sum of its proper divisors (5874709).

70913921 is a wasteful number, since it uses less digits than its factorization.

70913921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419635 (or 419622 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 70913921 is about 8421.0403751556. The cubic root of 70913921 is about 413.9143657432.

The spelling of 70913921 in words is "seventy million, nine hundred thirteen thousand, nine hundred twenty-one".