77021293 has 2 divisors, whose sum is σ = 77021294. Its totient is φ = 77021292.

The previous prime is 77021291. The next prime is 77021311. The reversal of 77021293 is 39212077.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66536649 + 10484644 = 8157^2 + 3238^2 .

It is a cyclic number.

It is not a de Polignac number, because 77021293 - 2¹ = 77021291 is a prime.

Together with 77021291, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77021291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38510646 + 38510647.

It is an arithmetic number, because the mean of its divisors is an integer number (38510647).

Almost surely, 2^77021293 is an apocalyptic number.

It is an amenable number.

77021293 is a deficient number, since it is larger than the sum of its proper divisors (1).

77021293 is an equidigital number, since it uses as much as digits as its factorization.

77021293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 77021293 is about 8776.1775848031. The cubic root of 77021293 is about 425.4712981588.

The spelling of 77021293 in words is "seventy-seven million, twenty-one thousand, two hundred ninety-three".