51521041001 has 2 divisors, whose sum is σ = 51521041002. Its totient is φ = 51521041000.

The previous prime is 51521040941. The next prime is 51521041021. The reversal of 51521041001 is 10014012515.

It is an a-pointer prime, because the next prime (51521041021) can be obtained adding 51521041001 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49584600976 + 1936440025 = 222676^2 + 44005^2 .

It is a cyclic number.

It is not a de Polignac number, because 51521041001 - 2⁶ = 51521040937 is a prime.

It is not a weakly prime, because it can be changed into another prime (51521041021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25760520500 + 25760520501.

It is an arithmetic number, because the mean of its divisors is an integer number (25760520501).

Almost surely, 2^51521041001 is an apocalyptic number.

It is an amenable number.

51521041001 is a deficient number, since it is larger than the sum of its proper divisors (1).

51521041001 is an equidigital number, since it uses as much as digits as its factorization.

51521041001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 200, while the sum is 20.

Adding to 51521041001 its reverse (10014012515), we get a palindrome (61535053516).

The spelling of 51521041001 in words is "fifty-one billion, five hundred twenty-one million, forty-one thousand, one".