77146397 has 2 divisors, whose sum is σ = 77146398. Its totient is φ = 77146396.

The previous prime is 77146387. The next prime is 77146417. The reversal of 77146397 is 79364177.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75672601 + 1473796 = 8699^2 + 1214^2 .

It is a cyclic number.

It is not a de Polignac number, because 77146397 - 2⁸ = 77146141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77146367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38573198 + 38573199.

It is an arithmetic number, because the mean of its divisors is an integer number (38573199).

Almost surely, 2^77146397 is an apocalyptic number.

It is an amenable number.

77146397 is a deficient number, since it is larger than the sum of its proper divisors (1).

77146397 is an equidigital number, since it uses as much as digits as its factorization.

77146397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 222264, while the sum is 44.

The square root of 77146397 is about 8783.3021694577. The cubic root of 77146397 is about 425.7015347860.

The spelling of 77146397 in words is "seventy-seven million, one hundred forty-six thousand, three hundred ninety-seven".