81125602132 has 12 divisors (see below), whose sum is σ = 141973056820. Its totient is φ = 40561871616.

The previous prime is 81125602121. The next prime is 81125602171. The reversal of 81125602132 is 23120652118.

It can be written as a sum of positive squares in 2 ways, for example, as 24231903556 + 56893698576 = 155666^2 + 238524^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81125602094 and 81125602103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12957 + ... + 403012.

Almost surely, 2^81125602132 is an apocalyptic number.

It is an amenable number.

81125602132 is a deficient number, since it is larger than the sum of its proper divisors (60847454688).

81125602132 is a wasteful number, since it uses less digits than its factorization.

81125602132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464730 (or 464728 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The spelling of 81125602132 in words is "eighty-one billion, one hundred twenty-five million, six hundred two thousand, one hundred thirty-two".