91970554073 has 4 divisors (see below), whose sum is σ = 91971291060. Its totient is φ = 91969817088.

The previous prime is 91970554037. The next prime is 91970554133. The reversal of 91970554073 is 37045507919.

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: 37045507919 = 7 ⋅5292215417.

It can be written as a sum of positive squares in 2 ways, for example, as 429815824 + 91540738249 = 20732^2 + 302557^2 .

It is a cyclic number.

It is not a de Polignac number, because 91970554073 - 2¹⁶ = 91970488537 is a prime.

It is a super-3 number, since 3×91970554073³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91970524073) 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, 129740 + ... + 448077.

It is an arithmetic number, because the mean of its divisors is an integer number (22992822765).

Almost surely, 2^91970554073 is an apocalyptic number.

It is an amenable number.

91970554073 is a deficient number, since it is larger than the sum of its proper divisors (736987).

91970554073 is a wasteful number, since it uses less digits than its factorization.

91970554073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736986.

The product of its (nonzero) digits is 1190700, while the sum is 50.

The spelling of 91970554073 in words is "ninety-one billion, nine hundred seventy million, five hundred fifty-four thousand, seventy-three".