1010721731 has 2 divisors, whose sum is σ = 1010721732. Its totient is φ = 1010721730.

The previous prime is 1010721721. The next prime is 1010721769. The reversal of 1010721731 is 1371270101.

It is a weak prime.

It is an emirp because it is prime and its reverse (1371270101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1010721731 - 2²² = 1006527427 is a prime.

It is a super-2 number, since 2×1010721731² = 2043116835031272722, which contains 22 as substring.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 1010721697 and 1010721706.

It is not a weakly prime, because it can be changed into another prime (1010721721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505360865 + 505360866.

It is an arithmetic number, because the mean of its divisors is an integer number (505360866).

Almost surely, 2^1010721731 is an apocalyptic number.

1010721731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1010721731 is an equidigital number, since it uses as much as digits as its factorization.

1010721731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 294, while the sum is 23.

The square root of 1010721731 is about 31791.8500719917. The cubic root of 1010721731 is about 1003.5612130403.

Adding to 1010721731 its reverse (1371270101), we get a palindrome (2381991832).

The spelling of 1010721731 in words is "one billion, ten million, seven hundred twenty-one thousand, seven hundred thirty-one".