71098961 has 4 divisors (see below), whose sum is σ = 72833124. Its totient is φ = 69364800.

The previous prime is 71098949. The next prime is 71098967. The reversal of 71098961 is 16989017.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16989017 = 907 ⋅18731.

It can be written as a sum of positive squares in 2 ways, for example, as 4774225 + 66324736 = 2185^2 + 8144^2 .

It is a cyclic number.

It is not a de Polignac number, because 71098961 - 2¹⁴ = 71082577 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 1734121 = 71098961 / (7 + 1 + 0 + 9 + 8 + 9 + 6 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71098967) 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, 867020 + ... + 867101.

It is an arithmetic number, because the mean of its divisors is an integer number (18208281).

Almost surely, 2^71098961 is an apocalyptic number.

It is an amenable number.

71098961 is a deficient number, since it is larger than the sum of its proper divisors (1734163).

71098961 is a wasteful number, since it uses less digits than its factorization.

71098961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1734162.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 71098961 is about 8432.0199833729. The cubic root of 71098961 is about 414.2740703539.

The spelling of 71098961 in words is "seventy-one million, ninety-eight thousand, nine hundred sixty-one".