81241985242 has 32 divisors (see below), whose sum is σ = 136423425600. Its totient is φ = 35965883520.

The previous prime is 81241985239. The next prime is 81241985249. The reversal of 81241985242 is 24258914218.

It is a happy number.

It is a super-2 number, since 2×81241985242² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81241985192 and 81241985201.

It is not an unprimeable number, because it can be changed into a prime (81241985249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207118 + ... + 453190.

It is an arithmetic number, because the mean of its divisors is an integer number (4263232050).

Almost surely, 2^81241985242 is an apocalyptic number.

81241985242 is a deficient number, since it is larger than the sum of its proper divisors (55181440358).

81241985242 is a wasteful number, since it uses less digits than its factorization.

81241985242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246478.

The product of its digits is 368640, while the sum is 46.

The spelling of 81241985242 in words is "eighty-one billion, two hundred forty-one million, nine hundred eighty-five thousand, two hundred forty-two".