81377157 has 8 divisors (see below), whose sum is σ = 108545184. Its totient is φ = 54230288.

The previous prime is 81377119. The next prime is 81377167. The reversal of 81377157 is 75177318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81377157 - 2⁷ = 81377029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81377117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10018 + ... + 16220.

It is an arithmetic number, because the mean of its divisors is an integer number (13568148).

Almost surely, 2^81377157 is an apocalyptic number.

It is an amenable number.

81377157 is a deficient number, since it is larger than the sum of its proper divisors (27168027).

81377157 is a wasteful number, since it uses less digits than its factorization.

81377157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10579.

The product of its digits is 41160, while the sum is 39.

The square root of 81377157 is about 9020.9288324429. The cubic root of 81377157 is about 433.3453802699.

The spelling of 81377157 in words is "eighty-one million, three hundred seventy-seven thousand, one hundred fifty-seven".