51155032249 has 2 divisors, whose sum is σ = 51155032250. Its totient is φ = 51155032248.

The previous prime is 51155032217. The next prime is 51155032273. The reversal of 51155032249 is 94223055115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27941462649 + 23213569600 = 167157^2 + 152360^2 .

It is a cyclic number.

It is not a de Polignac number, because 51155032249 - 2⁵ = 51155032217 is a prime.

It is not a weakly prime, because it can be changed into another prime (51155032289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25577516124 + 25577516125.

It is an arithmetic number, because the mean of its divisors is an integer number (25577516125).

Almost surely, 2^51155032249 is an apocalyptic number.

It is an amenable number.

51155032249 is a deficient number, since it is larger than the sum of its proper divisors (1).

51155032249 is an equidigital number, since it uses as much as digits as its factorization.

51155032249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54000, while the sum is 37.

The spelling of 51155032249 in words is "fifty-one billion, one hundred fifty-five million, thirty-two thousand, two hundred forty-nine".