70900091 has 4 divisors (see below), whose sum is σ = 70917000. Its totient is φ = 70883184.

The previous prime is 70900079. The next prime is 70900097. The reversal of 70900091 is 19000907.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 19000907 = 1471 ⋅12917.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70900091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 70900091.

It is not an unprimeable number, because it can be changed into a prime (70900097) 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, 3095 + ... + 12303.

It is an arithmetic number, because the mean of its divisors is an integer number (17729250).

Almost surely, 2^70900091 is an apocalyptic number.

70900091 is a deficient number, since it is larger than the sum of its proper divisors (16909).

70900091 is an equidigital number, since it uses as much as digits as its factorization.

70900091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16908.

The product of its (nonzero) digits is 567, while the sum is 26.

The square root of 70900091 is about 8420.2191776699. The cubic root of 70900091 is about 413.8874560863.

Adding to 70900091 its reverse (19000907), we get a palindrome (89900998).

The spelling of 70900091 in words is "seventy million, nine hundred thousand, ninety-one".