70816861 has 2 divisors, whose sum is σ = 70816862. Its totient is φ = 70816860.

The previous prime is 70816859. The next prime is 70816871. The reversal of 70816861 is 16861807.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70660836 + 156025 = 8406^2 + 395^2 .

It is a cyclic number.

It is not a de Polignac number, because 70816861 - 2¹ = 70816859 is a prime.

Together with 70816859, 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 70816861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70816841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35408430 + 35408431.

It is an arithmetic number, because the mean of its divisors is an integer number (35408431).

Almost surely, 2^70816861 is an apocalyptic number.

It is an amenable number.

70816861 is a deficient number, since it is larger than the sum of its proper divisors (1).

70816861 is an equidigital number, since it uses as much as digits as its factorization.

70816861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 70816861 is about 8415.2754559788. The cubic root of 70816861 is about 413.7254377645.

The spelling of 70816861 in words is "seventy million, eight hundred sixteen thousand, eight hundred sixty-one".