77561147 has 2 divisors, whose sum is σ = 77561148. Its totient is φ = 77561146.

The previous prime is 77561131. The next prime is 77561153. The reversal of 77561147 is 74116577.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77561147 - 2⁴ = 77561131 is a prime.

It is a super-3 number, since 3×77561147³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77561147.

It is not a weakly prime, because it can be changed into another prime (77561177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38780573 + 38780574.

It is an arithmetic number, because the mean of its divisors is an integer number (38780574).

Almost surely, 2^77561147 is an apocalyptic number.

77561147 is a deficient number, since it is larger than the sum of its proper divisors (1).

77561147 is an equidigital number, since it uses as much as digits as its factorization.

77561147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41160, while the sum is 38.

The square root of 77561147 is about 8806.8806623004. The cubic root of 77561147 is about 426.4630490700.

The spelling of 77561147 in words is "seventy-seven million, five hundred sixty-one thousand, one hundred forty-seven".