1011129491 has 2 divisors, whose sum is σ = 1011129492. Its totient is φ = 1011129490.

The previous prime is 1011129463. The next prime is 1011129503. The reversal of 1011129491 is 1949211101.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1011129491 - 2¹⁰ = 1011128467 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1011129461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505564745 + 505564746.

It is an arithmetic number, because the mean of its divisors is an integer number (505564746).

Almost surely, 2^1011129491 is an apocalyptic number.

1011129491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011129491 is an equidigital number, since it uses as much as digits as its factorization.

1011129491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 29.

The square root of 1011129491 is about 31798.2623896338. The cubic root of 1011129491 is about 1003.6961519623.

The spelling of 1011129491 in words is "one billion, eleven million, one hundred twenty-nine thousand, four hundred ninety-one".