61520077 has 2 divisors, whose sum is σ = 61520078. Its totient is φ = 61520076.

The previous prime is 61520071. The next prime is 61520099. The reversal of 61520077 is 77002516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42693156 + 18826921 = 6534^2 + 4339^2 .

It is a cyclic number.

It is not a de Polignac number, because 61520077 - 2¹⁹ = 60995789 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61520071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30760038 + 30760039.

It is an arithmetic number, because the mean of its divisors is an integer number (30760039).

Almost surely, 2^61520077 is an apocalyptic number.

It is an amenable number.

61520077 is a deficient number, since it is larger than the sum of its proper divisors (1).

61520077 is an equidigital number, since it uses as much as digits as its factorization.

61520077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 61520077 is about 7843.4735289921. The cubic root of 61520077 is about 394.7652870396.

The spelling of 61520077 in words is "sixty-one million, five hundred twenty thousand, seventy-seven".