84261897841 has 15 divisors (see below), whose sum is σ = 92726164105. Its totient is φ = 76569794620.

The previous prime is 84261897827. The next prime is 84261897913. The reversal of 84261897841 is 14879816248.

The square root of 84261897841 is 290279.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 84261897841 - 2⁵ = 84261897809 is a prime.

It is a super-2 number, since 2×84261897841² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84261898841) 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 14 ways as a sum of consecutive naturals, for example, 35122560 + ... + 35124958.

Almost surely, 2^84261897841 is an apocalyptic number.

84261897841 is the 290279-th square number.

84261897841 is the 145140-th centered octagonal number.

It is an amenable number.

84261897841 is a deficient number, since it is larger than the sum of its proper divisors (8464266264).

84261897841 is an frugal number, since it uses more digits than its factorization.

84261897841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4842 (or 2410 counting only the distinct ones).

The product of its digits is 6193152, while the sum is 58.

The spelling of 84261897841 in words is "eighty-four billion, two hundred sixty-one million, eight hundred ninety-seven thousand, eight hundred forty-one".