70891973 has 2 divisors, whose sum is σ = 70891974. Its totient is φ = 70891972.

The previous prime is 70891969. The next prime is 70892011. The reversal of 70891973 is 37919807.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69772609 + 1119364 = 8353^2 + 1058^2 .

It is an emirp because it is prime and its reverse (37919807) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70891973 - 2² = 70891969 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70851973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35445986 + 35445987.

It is an arithmetic number, because the mean of its divisors is an integer number (35445987).

Almost surely, 2^70891973 is an apocalyptic number.

It is an amenable number.

70891973 is a deficient number, since it is larger than the sum of its proper divisors (1).

70891973 is an equidigital number, since it uses as much as digits as its factorization.

70891973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 70891973 is about 8419.7371099103. The cubic root of 70891973 is about 413.8716588963.

The spelling of 70891973 in words is "seventy million, eight hundred ninety-one thousand, nine hundred seventy-three".