70642961 has 4 divisors (see below), whose sum is σ = 70728000. Its totient is φ = 70557924.

The previous prime is 70642921. The next prime is 70642963. The reversal of 70642961 is 16924607.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16924607 = 7 ⋅2417801.

It is a cyclic number.

It is not a de Polignac number, because 70642961 - 2¹⁰ = 70641937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (70642963) 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, 41261 + ... + 42938.

It is an arithmetic number, because the mean of its divisors is an integer number (17682000).

Almost surely, 2^70642961 is an apocalyptic number.

It is an amenable number.

70642961 is a deficient number, since it is larger than the sum of its proper divisors (85039).

70642961 is an equidigital number, since it uses as much as digits as its factorization.

70642961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85038.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 70642961 is about 8404.9367041043. The cubic root of 70642961 is about 413.3865080016.

The spelling of 70642961 in words is "seventy million, six hundred forty-two thousand, nine hundred sixty-one".