521540051 has 2 divisors, whose sum is σ = 521540052. Its totient is φ = 521540050.

The previous prime is 521540029. The next prime is 521540053. The reversal of 521540051 is 150045125.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521540051 is a prime.

Together with 521540053, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 521539999 and 521540026.

It is not a weakly prime, because it can be changed into another prime (521540053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260770025 + 260770026.

It is an arithmetic number, because the mean of its divisors is an integer number (260770026).

Almost surely, 2^521540051 is an apocalyptic number.

521540051 is a deficient number, since it is larger than the sum of its proper divisors (1).

521540051 is an equidigital number, since it uses as much as digits as its factorization.

521540051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 521540051 is about 22837.2513889041. The cubic root of 521540051 is about 804.9382311825.

Adding to 521540051 its reverse (150045125), we get a palindrome (671585176).

The spelling of 521540051 in words is "five hundred twenty-one million, five hundred forty thousand, fifty-one".