61720053 has 4 divisors (see below), whose sum is σ = 82293408. Its totient is φ = 41146700.

The previous prime is 61720019. The next prime is 61720079. The reversal of 61720053 is 35002716.

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 61720053 - 2¹⁰ = 61719029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61721053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10286673 + ... + 10286678.

It is an arithmetic number, because the mean of its divisors is an integer number (20573352).

Almost surely, 2^61720053 is an apocalyptic number.

It is an amenable number.

61720053 is a deficient number, since it is larger than the sum of its proper divisors (20573355).

61720053 is a wasteful number, since it uses less digits than its factorization.

61720053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20573354.

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 61720053 is about 7856.2111096889. The cubic root of 61720053 is about 395.1925632694.

Adding to 61720053 its reverse (35002716), we get a palindrome (96722769).

The spelling of 61720053 in words is "sixty-one million, seven hundred twenty thousand, fifty-three".