81158152 has 8 divisors (see below), whose sum is σ = 152171550. Its totient is φ = 40579072.

The previous prime is 81158149. The next prime is 81158171. The reversal of 81158152 is 25185118.

It can be written as a sum of positive squares in only one way, i.e., 72829156 + 8328996 = 8534^2 + 2886^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5072377 + ... + 5072392.

Almost surely, 2^81158152 is an apocalyptic number.

It is an amenable number.

81158152 is a deficient number, since it is larger than the sum of its proper divisors (71013398).

81158152 is a wasteful number, since it uses less digits than its factorization.

81158152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10144775 (or 10144771 counting only the distinct ones).

The product of its digits is 3200, while the sum is 31.

The square root of 81158152 is about 9008.7819376428. The cubic root of 81158152 is about 432.9562863561.

The spelling of 81158152 in words is "eighty-one million, one hundred fifty-eight thousand, one hundred fifty-two".