70361581 has 4 divisors (see below), whose sum is σ = 71689212. Its totient is φ = 69033952.

The previous prime is 70361567. The next prime is 70361593. The reversal of 70361581 is 18516307.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22184100 + 48177481 = 4710^2 + 6941^2 .

It is a cyclic number.

It is not a de Polignac number, because 70361581 - 2²⁵ = 36807149 is a prime.

It is a super-2 number, since 2×70361581² = 9901504161639122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70361881) 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, 663736 + ... + 663841.

It is an arithmetic number, because the mean of its divisors is an integer number (17922303).

Almost surely, 2^70361581 is an apocalyptic number.

It is an amenable number.

70361581 is a deficient number, since it is larger than the sum of its proper divisors (1327631).

70361581 is a wasteful number, since it uses less digits than its factorization.

70361581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327630.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 70361581 is about 8388.1810304738. The cubic root of 70361581 is about 412.8369204510.

Adding to 70361581 its reverse (18516307), we get a palindrome (88877888).

The spelling of 70361581 in words is "seventy million, three hundred sixty-one thousand, five hundred eighty-one".