70840981 has 4 divisors (see below), whose sum is σ = 71398912. Its totient is φ = 70283052.

The previous prime is 70840967. The next prime is 70840993. The reversal of 70840981 is 18904807.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 70840981 - 2¹⁷ = 70709909 is a prime.

It is a super-2 number, since 2×70840981² = 10036889178084722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 70840981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70840961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278775 + ... + 279028.

It is an arithmetic number, because the mean of its divisors is an integer number (17849728).

Almost surely, 2^70840981 is an apocalyptic number.

It is an amenable number.

70840981 is a deficient number, since it is larger than the sum of its proper divisors (557931).

70840981 is a wasteful number, since it uses less digits than its factorization.

70840981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557930.

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

The square root of 70840981 is about 8416.7084421405. The cubic root of 70840981 is about 413.7724036268.

The spelling of 70840981 in words is "seventy million, eight hundred forty thousand, nine hundred eighty-one".