516891551 has 24 divisors (see below), whose sum is σ = 600964224. Its totient is φ = 443520000.

The previous prime is 516891541. The next prime is 516891559. The reversal of 516891551 is 155198615.

It is not a de Polignac number, because 516891551 - 2¹⁰ = 516890527 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a junction number, because it is equal to n+sod(n) for n = 516891499 and 516891508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516891559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 152111 + ... + 155471.

It is an arithmetic number, because the mean of its divisors is an integer number (25040176).

Almost surely, 2^516891551 is an apocalyptic number.

516891551 is a deficient number, since it is larger than the sum of its proper divisors (84072673).

516891551 is a wasteful number, since it uses less digits than its factorization.

516891551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3455 (or 3444 counting only the distinct ones).

The product of its digits is 54000, while the sum is 41.

The square root of 516891551 is about 22735.2490859458. The cubic root of 516891551 is about 802.5396122435.

The spelling of 516891551 in words is "five hundred sixteen million, eight hundred ninety-one thousand, five hundred fifty-one".