51023389802549 has 2 divisors, whose sum is σ = 51023389802550. Its totient is φ = 51023389802548.

The previous prime is 51023389802519. The next prime is 51023389802677. The reversal of 51023389802549 is 94520898332015.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29423138976100 + 21600250826449 = 5424310^2 + 4647607^2 .

It is a cyclic number.

It is not a de Polignac number, because 51023389802549 - 2⁸ = 51023389802293 is a prime.

It is a super-2 number, since 2×51023389802549² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51023389802519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25511694901274 + 25511694901275.

It is an arithmetic number, because the mean of its divisors is an integer number (25511694901275).

Almost surely, 2^{51023389802549} is an apocalyptic number.

It is an amenable number.

51023389802549 is a deficient number, since it is larger than the sum of its proper divisors (1).

51023389802549 is an equidigital number, since it uses as much as digits as its factorization.

51023389802549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18662400, while the sum is 59.

The spelling of 51023389802549 in words is "fifty-one trillion, twenty-three billion, three hundred eighty-nine million, eight hundred two thousand, five hundred forty-nine".