81461307 has 8 divisors (see below), whose sum is σ = 111141184. Its totient is φ = 53044488.

The previous prime is 81461287. The next prime is 81461311. The reversal of 81461307 is 70316418.

It is a happy number.

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

It is not a de Polignac number, because 81461307 - 2⁶ = 81461243 is a prime.

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, 315613 + ... + 315870.

It is an arithmetic number, because the mean of its divisors is an integer number (13892648).

Almost surely, 2^81461307 is an apocalyptic number.

81461307 is a deficient number, since it is larger than the sum of its proper divisors (29679877).

81461307 is a wasteful number, since it uses less digits than its factorization.

81461307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631529.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 81461307 is about 9025.5917811521. The cubic root of 81461307 is about 433.4946992058.

It can be divided in two parts, 8146 and 1307, that added together give a triangular number (9453 = T₁₃₇).

The spelling of 81461307 in words is "eighty-one million, four hundred sixty-one thousand, three hundred seven".