81377162 has 4 divisors (see below), whose sum is σ = 122065746. Its totient is φ = 40688580.

The previous prime is 81377119. The next prime is 81377167. The reversal of 81377162 is 26177318.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 79584241 + 1792921 = 8921^2 + 1339^2 .

It is not an unprimeable number, because it can be changed into a prime (81377167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20344289 + ... + 20344292.

Almost surely, 2^81377162 is an apocalyptic number.

81377162 is a deficient number, since it is larger than the sum of its proper divisors (40688584).

81377162 is a wasteful number, since it uses less digits than its factorization.

81377162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40688583.

The product of its digits is 14112, while the sum is 35.

The square root of 81377162 is about 9020.9291095762. The cubic root of 81377162 is about 433.3453891452.

The spelling of 81377162 in words is "eighty-one million, three hundred seventy-seven thousand, one hundred sixty-two".