70206431 has 4 divisors (see below), whose sum is σ = 71095200. Its totient is φ = 69317664.

The previous prime is 70206403. The next prime is 70206449. The reversal of 70206431 is 13460207.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70206431 is a prime.

It is a super-2 number, since 2×70206431² = 9857885907515522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 70206397 and 70206406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70206491) 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, 444266 + ... + 444423.

It is an arithmetic number, because the mean of its divisors is an integer number (17773800).

Almost surely, 2^70206431 is an apocalyptic number.

70206431 is a deficient number, since it is larger than the sum of its proper divisors (888769).

70206431 is an equidigital number, since it uses as much as digits as its factorization.

70206431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888768.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 70206431 is about 8378.9277953686. The cubic root of 70206431 is about 412.5332567004.

Adding to 70206431 its reverse (13460207), we get a palindrome (83666638).

The spelling of 70206431 in words is "seventy million, two hundred six thousand, four hundred thirty-one".