1010621681 has 2 divisors, whose sum is σ = 1010621682. Its totient is φ = 1010621680.

The previous prime is 1010621653. The next prime is 1010621687. The reversal of 1010621681 is 1861260101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 902461681 + 108160000 = 30041^2 + 10400^2 .

It is a cyclic number.

It is not a de Polignac number, because 1010621681 - 2⁶ = 1010621617 is a prime.

It is a super-2 number, since 2×1010621681² = 2042712364214531522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1010621681.

It is not a weakly prime, because it can be changed into another prime (1010621687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505310840 + 505310841.

It is an arithmetic number, because the mean of its divisors is an integer number (505310841).

Almost surely, 2^1010621681 is an apocalyptic number.

It is an amenable number.

1010621681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1010621681 is an equidigital number, since it uses as much as digits as its factorization.

1010621681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 1010621681 is about 31790.2765165703. The cubic root of 1010621681 is about 1003.5280982177.

Adding to 1010621681 its reverse (1861260101), we get a palindrome (2871881782).

The spelling of 1010621681 in words is "one billion, ten million, six hundred twenty-one thousand, six hundred eighty-one".