51212131 has 2 divisors, whose sum is σ = 51212132. Its totient is φ = 51212130.

The previous prime is 51212101. The next prime is 51212137. The reversal of 51212131 is 13121215.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51212131 - 2¹³ = 51203939 is a prime.

It is a super-2 number, since 2×51212131² = 5245364723122322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51212137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25606065 + 25606066.

It is an arithmetic number, because the mean of its divisors is an integer number (25606066).

Almost surely, 2^51212131 is an apocalyptic number.

51212131 is a deficient number, since it is larger than the sum of its proper divisors (1).

51212131 is an equidigital number, since it uses as much as digits as its factorization.

51212131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60, while the sum is 16.

The square root of 51212131 is about 7156.2651571892. The cubic root of 51212131 is about 371.3564309951.

Adding to 51212131 its reverse (13121215), we get a palindrome (64333346).

The spelling of 51212131 in words is "fifty-one million, two hundred twelve thousand, one hundred thirty-one".