51380369 has 2 divisors, whose sum is σ = 51380370. Its totient is φ = 51380368.

The previous prime is 51380359. The next prime is 51380429. The reversal of 51380369 is 96308315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41770369 + 9610000 = 6463^2 + 3100^2 .

It is a cyclic number.

It is not a de Polignac number, because 51380369 - 2²⁰ = 50331793 is a prime.

It is a super-2 number, since 2×51380369² = 5279884637152322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51380359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25690184 + 25690185.

It is an arithmetic number, because the mean of its divisors is an integer number (25690185).

Almost surely, 2^51380369 is an apocalyptic number.

It is an amenable number.

51380369 is a deficient number, since it is larger than the sum of its proper divisors (1).

51380369 is an equidigital number, since it uses as much as digits as its factorization.

51380369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 51380369 is about 7168.0101143902. The cubic root of 51380369 is about 371.7626366642.

The spelling of 51380369 in words is "fifty-one million, three hundred eighty thousand, three hundred sixty-nine".