61445861 has 4 divisors (see below), whose sum is σ = 61462752. Its totient is φ = 61428972.

The previous prime is 61445831. The next prime is 61445887. The reversal of 61445861 is 16854416.

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 61445861 - 2¹⁴ = 61429477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61445801) 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, 491 + ... + 11096.

It is an arithmetic number, because the mean of its divisors is an integer number (15365688).

Almost surely, 2^61445861 is an apocalyptic number.

It is an amenable number.

61445861 is a deficient number, since it is larger than the sum of its proper divisors (16891).

61445861 is a wasteful number, since it uses less digits than its factorization.

61445861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16890.

The product of its digits is 23040, while the sum is 35.

The square root of 61445861 is about 7838.7410341202. The cubic root of 61445861 is about 394.6064787760.

The spelling of 61445861 in words is "sixty-one million, four hundred forty-five thousand, eight hundred sixty-one".