61564953 has 4 divisors (see below), whose sum is σ = 82086608. Its totient is φ = 41043300.

The previous prime is 61564913. The next prime is 61564961. The reversal of 61564953 is 35946516.

61564953 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 61564953 - 2⁹ = 61564441 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61564913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10260823 + ... + 10260828.

It is an arithmetic number, because the mean of its divisors is an integer number (20521652).

Almost surely, 2^61564953 is an apocalyptic number.

It is an amenable number.

61564953 is a deficient number, since it is larger than the sum of its proper divisors (20521655).

61564953 is a wasteful number, since it uses less digits than its factorization.

61564953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20521654.

The product of its digits is 97200, while the sum is 39.

The square root of 61564953 is about 7846.3337298384. Note that the first 3 decimals coincide. The cubic root of 61564953 is about 394.8612512738.

The spelling of 61564953 in words is "sixty-one million, five hundred sixty-four thousand, nine hundred fifty-three".