197541421587 has 6 divisors (see below), whose sum is σ = 285337608972. Its totient is φ = 131694281052.

The previous prime is 197541421577. The next prime is 197541421639. The reversal of 197541421587 is 785124145791.

197541421587 is a `hidden beast` number, since 1 + 9 + 7 + 5 + 414 + 215 + 8 + 7 = 666.

It is not a de Polignac number, because 197541421587 - 2¹⁰ = 197541420563 is a prime.

It is a super-2 number, since 2×197541421587² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (197541421577) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10974523413 + ... + 10974523430.

It is an arithmetic number, because the mean of its divisors is an integer number (47556268162).

Almost surely, 2^197541421587 is an apocalyptic number.

197541421587 is a deficient number, since it is larger than the sum of its proper divisors (87796187385).

197541421587 is a wasteful number, since it uses less digits than its factorization.

197541421587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21949046849 (or 21949046846 counting only the distinct ones).

The product of its digits is 2822400, while the sum is 54.

It can be divided in two parts, 1975414 and 21587, that added together give a triangular number (1997001 = T₁₉₉₈).

The spelling of 197541421587 in words is "one hundred ninety-seven billion, five hundred forty-one million, four hundred twenty-one thousand, five hundred eighty-seven".