991273741 has 2 divisors, whose sum is σ = 991273742. Its totient is φ = 991273740.

The previous prime is 991273739. The next prime is 991273747. The reversal of 991273741 is 147372199.

It is a happy number.

991273741 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 818246025 + 173027716 = 28605^2 + 13154^2 .

It is a cyclic number.

It is not a de Polignac number, because 991273741 - 2¹ = 991273739 is a prime.

It is a super-2 number, since 2×991273741² = 1965247259192270162, which contains 22 as substring.

Together with 991273739, it forms a pair of twin primes.

It is the 31485-th Hogben number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991273747) by changing a digit.

It is a nontrivial repunit in base 31484.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495636870 + 495636871.

It is an arithmetic number, because the mean of its divisors is an integer number (495636871).

Almost surely, 2^991273741 is an apocalyptic number.

It is an amenable number.

991273741 is a deficient number, since it is larger than the sum of its proper divisors (1).

991273741 is an equidigital number, since it uses as much as digits as its factorization.

991273741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 43.

The square root of 991273741 is about 31484.5000119106. The cubic root of 991273741 is about 997.0827448983.

The spelling of 991273741 in words is "nine hundred ninety-one million, two hundred seventy-three thousand, seven hundred forty-one".