81461245 has 16 divisors (see below), whose sum is σ = 99486720. Its totient is φ = 64022400.

The previous prime is 81461243. The next prime is 81461257. The reversal of 81461245 is 54216418.

It is not a de Polignac number, because 81461245 - 2¹ = 81461243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81461243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106665 + ... + 107425.

It is an arithmetic number, because the mean of its divisors is an integer number (6217920).

Almost surely, 2^81461245 is an apocalyptic number.

It is an amenable number.

81461245 is a deficient number, since it is larger than the sum of its proper divisors (18025475).

81461245 is a wasteful number, since it uses less digits than its factorization.

81461245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116.

The product of its digits is 7680, while the sum is 31.

The square root of 81461245 is about 9025.5883464736. The cubic root of 81461245 is about 433.4945892285.

The spelling of 81461245 in words is "eighty-one million, four hundred sixty-one thousand, two hundred forty-five".