70531691 has 4 divisors (see below), whose sum is σ = 74680632. Its totient is φ = 66382752.

The previous prime is 70531687. The next prime is 70531693. The reversal of 70531691 is 19613507.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 70531691 - 2² = 70531687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70531693) 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, 2074445 + ... + 2074478.

It is an arithmetic number, because the mean of its divisors is an integer number (18670158).

Almost surely, 2^70531691 is an apocalyptic number.

70531691 is a deficient number, since it is larger than the sum of its proper divisors (4148941).

70531691 is a wasteful number, since it uses less digits than its factorization.

70531691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4148940.

The product of its (nonzero) digits is 5670, while the sum is 32.

The square root of 70531691 is about 8398.3147714288. The cubic root of 70531691 is about 413.1693517201.

The spelling of 70531691 in words is "seventy million, five hundred thirty-one thousand, six hundred ninety-one".