511004991 has 32 divisors (see below), whose sum is σ = 809932288. Its totient is φ = 280506240.

The previous prime is 511004987. The next prime is 511005031. The reversal of 511004991 is 199400115.

It is not a de Polignac number, because 511004991 - 2² = 511004987 is a prime.

It is a super-2 number, since 2×511004991² = 522252201653820162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511004941) 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, 50445 + ... + 59721.

It is an arithmetic number, because the mean of its divisors is an integer number (25310384).

Almost surely, 2^511004991 is an apocalyptic number.

511004991 is a deficient number, since it is larger than the sum of its proper divisors (298927297).

511004991 is a wasteful number, since it uses less digits than its factorization.

511004991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9391.

The product of its (nonzero) digits is 1620, while the sum is 30.

The square root of 511004991 is about 22605.4195050656. The cubic root of 511004991 is about 799.4814300750.

The spelling of 511004991 in words is "five hundred eleven million, four thousand, nine hundred ninety-one".