70801921 has 2 divisors, whose sum is σ = 70801922. Its totient is φ = 70801920.

The previous prime is 70801919. The next prime is 70801993. The reversal of 70801921 is 12910807.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47761921 + 23040000 = 6911^2 + 4800^2 .

It is a cyclic number.

It is not a de Polignac number, because 70801921 - 2¹ = 70801919 is a prime.

Together with 70801919, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 70801921.

It is not a weakly prime, because it can be changed into another prime (70801321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35400960 + 35400961.

It is an arithmetic number, because the mean of its divisors is an integer number (35400961).

Almost surely, 2^70801921 is an apocalyptic number.

It is an amenable number.

70801921 is a deficient number, since it is larger than the sum of its proper divisors (1).

70801921 is an equidigital number, since it uses as much as digits as its factorization.

70801921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 70801921 is about 8414.3877376788. The cubic root of 70801921 is about 413.6963416205.

The spelling of 70801921 in words is "seventy million, eight hundred one thousand, nine hundred twenty-one".