77142061 has 2 divisors, whose sum is σ = 77142062. Its totient is φ = 77142060.

The previous prime is 77142053. The next prime is 77142067. The reversal of 77142061 is 16024177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77105961 + 36100 = 8781^2 + 190^2 .

It is a cyclic number.

It is not a de Polignac number, because 77142061 - 2³ = 77142053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77142067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38571030 + 38571031.

It is an arithmetic number, because the mean of its divisors is an integer number (38571031).

Almost surely, 2^77142061 is an apocalyptic number.

It is an amenable number.

77142061 is a deficient number, since it is larger than the sum of its proper divisors (1).

77142061 is an equidigital number, since it uses as much as digits as its factorization.

77142061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 77142061 is about 8783.0553339940. The cubic root of 77142061 is about 425.6935591426.

The spelling of 77142061 in words is "seventy-seven million, one hundred forty-two thousand, sixty-one".