70656961 has 4 divisors (see below), whose sum is σ = 71305300. Its totient is φ = 70008624.

The previous prime is 70656959. The next prime is 70656973. The reversal of 70656961 is 16965607.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16965607 = 43 ⋅394549.

It can be written as a sum of positive squares in 2 ways, for example, as 22090000 + 48566961 = 4700^2 + 6969^2 .

It is a cyclic number.

It is not a de Polignac number, because 70656961 - 2¹ = 70656959 is a prime.

It is a super-2 number, since 2×70656961² = 9984812275511042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70656941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324006 + ... + 324223.

It is an arithmetic number, because the mean of its divisors is an integer number (17826325).

Almost surely, 2^70656961 is an apocalyptic number.

It is an amenable number.

70656961 is a deficient number, since it is larger than the sum of its proper divisors (648339).

70656961 is a wasteful number, since it uses less digits than its factorization.

70656961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648338.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 70656961 is about 8405.7695067138. The cubic root of 70656961 is about 413.4138144676.

It can be divided in two parts, 70656 and 961, that added together give a palindrome (71617).

The spelling of 70656961 in words is "seventy million, six hundred fifty-six thousand, nine hundred sixty-one".