81461377 has 8 divisors (see below), whose sum is σ = 87935040. Its totient is φ = 75232080.

The previous prime is 81461333. The next prime is 81461381. The reversal of 81461377 is 77316418.

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

It is not a de Polignac number, because 81461377 - 2¹⁵ = 81428609 is a prime.

It is a super-2 number, since 2×81461377² = 13271911885472258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81461327) 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, 60399 + ... + 61732.

It is an arithmetic number, because the mean of its divisors is an integer number (10991880).

Almost surely, 2^81461377 is an apocalyptic number.

It is an amenable number.

81461377 is a deficient number, since it is larger than the sum of its proper divisors (6473663).

81461377 is a wasteful number, since it uses less digits than its factorization.

81461377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122183.

The product of its digits is 28224, while the sum is 37.

The square root of 81461377 is about 9025.5956590133. The cubic root of 81461377 is about 433.4948233736.

The spelling of 81461377 in words is "eighty-one million, four hundred sixty-one thousand, three hundred seventy-seven".