1010551721 has 2 divisors, whose sum is σ = 1010551722. Its totient is φ = 1010551720.

The previous prime is 1010551709. The next prime is 1010551741. The reversal of 1010551721 is 1271550101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 983136025 + 27415696 = 31355^2 + 5236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1010551721 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1010551741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505275860 + 505275861.

It is an arithmetic number, because the mean of its divisors is an integer number (505275861).

Almost surely, 2^1010551721 is an apocalyptic number.

It is an amenable number.

1010551721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1010551721 is an equidigital number, since it uses as much as digits as its factorization.

1010551721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 350, while the sum is 23.

The square root of 1010551721 is about 31789.1761610772. The cubic root of 1010551721 is about 1003.5049413671.

The spelling of 1010551721 in words is "one billion, ten million, five hundred fifty-one thousand, seven hundred twenty-one".