61780101 has 4 divisors (see below), whose sum is σ = 82373472. Its totient is φ = 41186732.

The previous prime is 61780067. The next prime is 61780111. The reversal of 61780101 is 10108716.

61780101 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 a cyclic number.

It is not a de Polignac number, because 61780101 - 2¹¹ = 61778053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61780111) 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, 10296681 + ... + 10296686.

It is an arithmetic number, because the mean of its divisors is an integer number (20593368).

Almost surely, 2^61780101 is an apocalyptic number.

It is an amenable number.

61780101 is a deficient number, since it is larger than the sum of its proper divisors (20593371).

61780101 is a wasteful number, since it uses less digits than its factorization.

61780101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20593370.

The product of its (nonzero) digits is 336, while the sum is 24.

The square root of 61780101 is about 7860.0318701644. The cubic root of 61780101 is about 395.3206838729.

Adding to 61780101 its reverse (10108716), we get a palindrome (71888817).

The spelling of 61780101 in words is "sixty-one million, seven hundred eighty thousand, one hundred one".