61045821 has 6 divisors (see below), whose sum is σ = 88177310. Its totient is φ = 40697208.

The previous prime is 61045807. The next prime is 61045823. The reversal of 61045821 is 12854016.

61045821 is a `hidden beast` number, since 610 + 45 + 8 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 53144100 + 7901721 = 7290^2 + 2811^2 .

It is not a de Polignac number, because 61045821 - 2¹³ = 61037629 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 (61045823) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3391426 + ... + 3391443.

Almost surely, 2^61045821 is an apocalyptic number.

It is an amenable number.

61045821 is a deficient number, since it is larger than the sum of its proper divisors (27131489).

61045821 is a wasteful number, since it uses less digits than its factorization.

61045821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6782875 (or 6782872 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 61045821 is about 7813.1825141872. The cubic root of 61045821 is about 393.7482587980.

Adding to 61045821 its reverse (12854016), we get a palindrome (73899837).

The spelling of 61045821 in words is "sixty-one million, forty-five thousand, eight hundred twenty-one".