52780391 has 2 divisors, whose sum is σ = 52780392. Its totient is φ = 52780390.

The previous prime is 52780381. The next prime is 52780457. The reversal of 52780391 is 19308725.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 52780391 - 2⁶ = 52780327 is a prime.

It is a super-2 number, since 2×52780391² = 5571539348225762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52780381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26390195 + 26390196.

It is an arithmetic number, because the mean of its divisors is an integer number (26390196).

Almost surely, 2^52780391 is an apocalyptic number.

52780391 is a deficient number, since it is larger than the sum of its proper divisors (1).

52780391 is an equidigital number, since it uses as much as digits as its factorization.

52780391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 52780391 is about 7265.0114246297. The cubic root of 52780391 is about 375.1090432521.

The spelling of 52780391 in words is "fifty-two million, seven hundred eighty thousand, three hundred ninety-one".