81376903 has 4 divisors (see below), whose sum is σ = 81396040. Its totient is φ = 81357768.

The previous prime is 81376877. The next prime is 81376931. The reversal of 81376903 is 30967318.

81376903 is a nontrivial binomial coefficient, being equal to C(12758, 2).

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30967318 = 2 ⋅15483659.

It is a 3-Lehmer number, since φ(81376903) divides (81376903-1)³.

It is a cyclic number.

It is not a de Polignac number, because 81376903 - 2¹³ = 81368711 is a prime.

It is a deceptive number, since it divides R_81376902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81376963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1 + ... + 12757.

It is an arithmetic number, because the mean of its divisors is an integer number (20349010).

Almost surely, 2^81376903 is an apocalyptic number.

81376903 is the 12757-th triangular number and also the 6379-th hexagonal number.

81376903 is the 4253-rd centered nonagonal number.

81376903 is a deficient number, since it is larger than the sum of its proper divisors (19137).

81376903 is a wasteful number, since it uses less digits than its factorization.

81376903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19136.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 81376903 is about 9020.9147540590. The cubic root of 81376903 is about 433.3449294070.

The spelling of 81376903 in words is "eighty-one million, three hundred seventy-six thousand, nine hundred three".