70918031 has 4 divisors (see below), whose sum is σ = 71012472. Its totient is φ = 70823592.

The previous prime is 70918027. The next prime is 70918037. The reversal of 70918031 is 13081907.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13081907 = 31 ⋅421997.

It is a cyclic number.

It is not a de Polignac number, because 70918031 - 2² = 70918027 is a prime.

It is a super-2 number, since 2×70918031² = 10058734241833922, 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 = 70917985 and 70918003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70918037) 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, 46085 + ... + 47598.

It is an arithmetic number, because the mean of its divisors is an integer number (17753118).

Almost surely, 2^70918031 is an apocalyptic number.

70918031 is a deficient number, since it is larger than the sum of its proper divisors (94441).

70918031 is an equidigital number, since it uses as much as digits as its factorization.

70918031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94440.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 70918031 is about 8421.2844032250. The cubic root of 70918031 is about 413.9223620818.

Adding to 70918031 its reverse (13081907), we get a palindrome (83999938).

The spelling of 70918031 in words is "seventy million, nine hundred eighteen thousand, thirty-one".