1011626491 has 2 divisors, whose sum is σ = 1011626492. Its totient is φ = 1011626490.

The previous prime is 1011626489. The next prime is 1011626527. The reversal of 1011626491 is 1946261101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1011626491 - 2¹ = 1011626489 is a prime.

Together with 1011626489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1011626461) 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, 505813245 + 505813246.

It is an arithmetic number, because the mean of its divisors is an integer number (505813246).

Almost surely, 2^1011626491 is an apocalyptic number.

1011626491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011626491 is an equidigital number, since it uses as much as digits as its factorization.

1011626491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 1011626491 is about 31806.0763219860. The cubic root of 1011626491 is about 1003.8605737906.

Adding to 1011626491 its reverse (1946261101), we get a palindrome (2957887592).

The spelling of 1011626491 in words is "one billion, eleven million, six hundred twenty-six thousand, four hundred ninety-one".