70406591 has 4 divisors (see below), whose sum is σ = 70448952. Its totient is φ = 70364232.

The previous prime is 70406587. The next prime is 70406599. The reversal of 70406591 is 19560407.

It is a happy number.

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 70406591 - 2² = 70406587 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70406599) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18581 + ... + 22046.

It is an arithmetic number, because the mean of its divisors is an integer number (17612238).

Almost surely, 2^70406591 is an apocalyptic number.

70406591 is a deficient number, since it is larger than the sum of its proper divisors (42361).

70406591 is a wasteful number, since it uses less digits than its factorization.

70406591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42360.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 70406591 is about 8390.8635431641. The cubic root of 70406591 is about 412.9249316862.

Adding to 70406591 its reverse (19560407), we get a palindrome (89966998).

It can be divided in two parts, 7040 and 6591, that added together give a palindrome (13631).

The spelling of 70406591 in words is "seventy million, four hundred six thousand, five hundred ninety-one".