1020491511 has 32 divisors (see below), whose sum is σ = 1516720128. Its totient is φ = 606078720.

The previous prime is 1020491489. The next prime is 1020491519. The reversal of 1020491511 is 1151940201.

It is a happy number.

It is not a de Polignac number, because 1020491511 - 2⁷ = 1020491383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020491519) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 551590 + ... + 553436.

It is an arithmetic number, because the mean of its divisors is an integer number (47397504).

Almost surely, 2^1020491511 is an apocalyptic number.

1020491511 is a deficient number, since it is larger than the sum of its proper divisors (496228617).

1020491511 is a wasteful number, since it uses less digits than its factorization.

1020491511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2351.

The product of its (nonzero) digits is 360, while the sum is 24.

The square root of 1020491511 is about 31945.1328217618. The cubic root of 1020491511 is about 1006.7843718752.

The spelling of 1020491511 in words is "one billion, twenty million, four hundred ninety-one thousand, five hundred eleven".