97909785541 has 4 divisors (see below), whose sum is σ = 97912161292. Its totient is φ = 97907409792.

The previous prime is 97909785497. The next prime is 97909785559. The reversal of 97909785541 is 14558790979.

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

It can be written as a sum of positive squares in 2 ways, for example, as 59562354916 + 38347430625 = 244054^2 + 195825^2 .

It is a cyclic number.

It is not a de Polignac number, because 97909785541 - 2³¹ = 95762301893 is a prime.

It is a super-2 number, since 2×97909785541² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97909785041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1124946 + ... + 1208851.

It is an arithmetic number, because the mean of its divisors is an integer number (24478040323).

Almost surely, 2^97909785541 is an apocalyptic number.

It is an amenable number.

97909785541 is a deficient number, since it is larger than the sum of its proper divisors (2375751).

97909785541 is a wasteful number, since it uses less digits than its factorization.

97909785541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2375750.

The product of its (nonzero) digits is 28576800, while the sum is 64.

The spelling of 97909785541 in words is "ninety-seven billion, nine hundred nine million, seven hundred eighty-five thousand, five hundred forty-one".