51549397 has 2 divisors, whose sum is σ = 51549398. Its totient is φ = 51549396.

The previous prime is 51549361. The next prime is 51549403. The reversal of 51549397 is 79394515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51251281 + 298116 = 7159^2 + 546^2 .

It is a cyclic number.

It is not a de Polignac number, because 51549397 - 2¹⁵ = 51516629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51549347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25774698 + 25774699.

It is an arithmetic number, because the mean of its divisors is an integer number (25774699).

Almost surely, 2^51549397 is an apocalyptic number.

It is an amenable number.

51549397 is a deficient number, since it is larger than the sum of its proper divisors (1).

51549397 is an equidigital number, since it uses as much as digits as its factorization.

51549397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 170100, while the sum is 43.

The square root of 51549397 is about 7179.7908743918. The cubic root of 51549397 is about 372.1698577789.

The spelling of 51549397 in words is "fifty-one million, five hundred forty-nine thousand, three hundred ninety-seven".