51229961 has 2 divisors, whose sum is σ = 51229962. Its totient is φ = 51229960.

The previous prime is 51229939. The next prime is 51229967. The reversal of 51229961 is 16992215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26419600 + 24810361 = 5140^2 + 4981^2 .

It is a cyclic number.

It is not a de Polignac number, because 51229961 - 2¹⁸ = 50967817 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51229967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25614980 + 25614981.

It is an arithmetic number, because the mean of its divisors is an integer number (25614981).

Almost surely, 2^51229961 is an apocalyptic number.

It is an amenable number.

51229961 is a deficient number, since it is larger than the sum of its proper divisors (1).

51229961 is an equidigital number, since it uses as much as digits as its factorization.

51229961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 35.

The square root of 51229961 is about 7157.5108103306. The cubic root of 51229961 is about 371.3995231087.

The spelling of 51229961 in words is "fifty-one million, two hundred twenty-nine thousand, nine hundred sixty-one".