51321511 has 2 divisors, whose sum is σ = 51321512. Its totient is φ = 51321510.

The previous prime is 51321499. The next prime is 51321539. The reversal of 51321511 is 11512315.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51321511 - 2⁷ = 51321383 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51321541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25660755 + 25660756.

It is an arithmetic number, because the mean of its divisors is an integer number (25660756).

Almost surely, 2^51321511 is an apocalyptic number.

51321511 is a deficient number, since it is larger than the sum of its proper divisors (1).

51321511 is an equidigital number, since it uses as much as digits as its factorization.

51321511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150, while the sum is 19.

The square root of 51321511 is about 7163.9033354729. The cubic root of 51321511 is about 371.6206267472.

Adding to 51321511 its reverse (11512315), we get a palindrome (62833826).

The spelling of 51321511 in words is "fifty-one million, three hundred twenty-one thousand, five hundred eleven".