991462657 has 2 divisors, whose sum is σ = 991462658. Its totient is φ = 991462656.

The previous prime is 991462651. The next prime is 991462663. The reversal of 991462657 is 756264199.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (991462651) and next prime (991462663).

It can be written as a sum of positive squares in only one way, i.e., 926837136 + 64625521 = 30444^2 + 8039^2 .

It is an emirp because it is prime and its reverse (756264199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 991462657 - 2⁷ = 991462529 is a prime.

It is the 31488-th Hogben number.

It is a self number, because there is not a number n which added to its sum of digits gives 991462657.

It is not a weakly prime, because it can be changed into another prime (991462651) by changing a digit.

It is a nontrivial repunit in base 31487.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495731328 + 495731329.

It is an arithmetic number, because the mean of its divisors is an integer number (495731329).

Almost surely, 2^991462657 is an apocalyptic number.

It is an amenable number.

991462657 is a deficient number, since it is larger than the sum of its proper divisors (1).

991462657 is an equidigital number, since it uses as much as digits as its factorization.

991462657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 49.

The square root of 991462657 is about 31487.5000119095. The cubic root of 991462657 is about 997.1460818997.

The spelling of 991462657 in words is "nine hundred ninety-one million, four hundred sixty-two thousand, six hundred fifty-seven".