73461581 has 4 divisors (see below), whose sum is σ = 77328000. Its totient is φ = 69595164.

The previous prime is 73461569. The next prime is 73461589. The reversal of 73461581 is 18516437.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 73461581 - 2¹⁸ = 73199437 is a prime.

It is a super-4 number, since 4×73461581⁴ (a number of 33 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73461589) 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, 1933181 + ... + 1933218.

It is an arithmetic number, because the mean of its divisors is an integer number (19332000).

Almost surely, 2^73461581 is an apocalyptic number.

It is an amenable number.

73461581 is a deficient number, since it is larger than the sum of its proper divisors (3866419).

73461581 is a wasteful number, since it uses less digits than its factorization.

73461581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3866418.

The product of its digits is 20160, while the sum is 35.

The square root of 73461581 is about 8570.9731652829. The cubic root of 73461581 is about 418.8129387539.

The spelling of 73461581 in words is "seventy-three million, four hundred sixty-one thousand, five hundred eighty-one".