61895581 has 4 divisors (see below), whose sum is σ = 67522464. Its totient is φ = 56268700.

The previous prime is 61895579. The next prime is 61895591. The reversal of 61895581 is 18559816.

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 61895581 - 2¹ = 61895579 is a prime.

It is a super-2 number, since 2×61895581² = 7662125894655122, 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 (61895551) 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, 2813425 + ... + 2813446.

It is an arithmetic number, because the mean of its divisors is an integer number (16880616).

Almost surely, 2^61895581 is an apocalyptic number.

It is an amenable number.

61895581 is a deficient number, since it is larger than the sum of its proper divisors (5626883).

61895581 is a wasteful number, since it uses less digits than its factorization.

61895581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5626882.

The product of its digits is 86400, while the sum is 43.

The square root of 61895581 is about 7867.3744667456. The cubic root of 61895581 is about 395.5668430578.

The spelling of 61895581 in words is "sixty-one million, eight hundred ninety-five thousand, five hundred eighty-one".