1011431321 has 2 divisors, whose sum is σ = 1011431322. Its totient is φ = 1011431320.

The previous prime is 1011431299. The next prime is 1011431329. The reversal of 1011431321 is 1231341101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 995718025 + 15713296 = 31555^2 + 3964^2 .

It is an emirp because it is prime and its reverse (1231341101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1011431321 - 2⁶ = 1011431257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1011431321.

It is not a weakly prime, because it can be changed into another prime (1011431329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505715660 + 505715661.

It is an arithmetic number, because the mean of its divisors is an integer number (505715661).

Almost surely, 2^1011431321 is an apocalyptic number.

It is an amenable number.

1011431321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011431321 is an equidigital number, since it uses as much as digits as its factorization.

1011431321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1011431321 is about 31803.0080495541. The cubic root of 1011431321 is about 1003.7960123901.

Adding to 1011431321 its reverse (1231341101), we get a palindrome (2242772422).

The spelling of 1011431321 in words is "one billion, eleven million, four hundred thirty-one thousand, three hundred twenty-one".