61374581 has 4 divisors (see below), whose sum is σ = 62871564. Its totient is φ = 59877600.

The previous prime is 61374563. The next prime is 61374587. The reversal of 61374581 is 18547316.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2775556 + 58599025 = 1666^2 + 7655^2 .

It is a cyclic number.

It is not a de Polignac number, because 61374581 - 2⁶ = 61374517 is a prime.

It is a super-2 number, since 2×61374581² = 7533678385851122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61374587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 748430 + ... + 748511.

It is an arithmetic number, because the mean of its divisors is an integer number (15717891).

Almost surely, 2^61374581 is an apocalyptic number.

It is an amenable number.

61374581 is a deficient number, since it is larger than the sum of its proper divisors (1496983).

61374581 is a wasteful number, since it uses less digits than its factorization.

61374581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1496982.

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

The square root of 61374581 is about 7834.1930662960. The cubic root of 61374581 is about 394.4538325669.

The spelling of 61374581 in words is "sixty-one million, three hundred seventy-four thousand, five hundred eighty-one".