5261145821 has 2 divisors, whose sum is σ = 5261145822. Its totient is φ = 5261145820.

The previous prime is 5261145793. The next prime is 5261145887. The reversal of 5261145821 is 1285411625.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4430899225 + 830246596 = 66565^2 + 28814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5261145821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5261145221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2630572910 + 2630572911.

It is an arithmetic number, because the mean of its divisors is an integer number (2630572911).

Almost surely, 2^5261145821 is an apocalyptic number.

It is an amenable number.

5261145821 is a deficient number, since it is larger than the sum of its proper divisors (1).

5261145821 is an equidigital number, since it uses as much as digits as its factorization.

5261145821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19200, while the sum is 35.

The square root of 5261145821 is about 72533.7564241643. The cubic root of 5261145821 is about 1739.2423950033.

The spelling of 5261145821 in words is "five billion, two hundred sixty-one million, one hundred forty-five thousand, eight hundred twenty-one".