70921493 has 4 divisors (see below), whose sum is σ = 71623788. Its totient is φ = 70219200.

The previous prime is 70921483. The next prime is 70921507. The reversal of 70921493 is 39412907.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39412907 = 1163 ⋅33889.

It can be written as a sum of positive squares in 2 ways, for example, as 62615569 + 8305924 = 7913^2 + 2882^2 .

It is a cyclic number.

It is not a de Polignac number, because 70921493 - 2⁶ = 70921429 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70921483) 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, 350996 + ... + 351197.

It is an arithmetic number, because the mean of its divisors is an integer number (17905947).

Almost surely, 2^70921493 is an apocalyptic number.

It is an amenable number.

70921493 is a deficient number, since it is larger than the sum of its proper divisors (702295).

70921493 is a wasteful number, since it uses less digits than its factorization.

70921493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702294.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 70921493 is about 8421.4899513091. The cubic root of 70921493 is about 413.9290974441.

The spelling of 70921493 in words is "seventy million, nine hundred twenty-one thousand, four hundred ninety-three".