991652131 has 2 divisors, whose sum is σ = 991652132. Its totient is φ = 991652130.

The previous prime is 991652113. The next prime is 991652147. The reversal of 991652131 is 131256199.

It is a happy number.

Together with previous prime (991652113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 991652131 - 2¹⁷ = 991521059 is a prime.

It is a super-2 number, since 2×991652131² = 1966747897833682322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (991652531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495826065 + 495826066.

It is an arithmetic number, because the mean of its divisors is an integer number (495826066).

Almost surely, 2^991652131 is an apocalyptic number.

991652131 is a deficient number, since it is larger than the sum of its proper divisors (1).

991652131 is an equidigital number, since it uses as much as digits as its factorization.

991652131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14580, while the sum is 37.

The square root of 991652131 is about 31490.5085859216. The cubic root of 991652131 is about 997.2095978985.

The spelling of 991652131 in words is "nine hundred ninety-one million, six hundred fifty-two thousand, one hundred thirty-one".