509873951 has 4 divisors (see below), whose sum is σ = 511025352. Its totient is φ = 508722552.

The previous prime is 509873899. The next prime is 509873981. The reversal of 509873951 is 159378905.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 509873951 - 2⁶ = 509873887 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 509873896 and 509873905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509873981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 575036 + ... + 575921.

It is an arithmetic number, because the mean of its divisors is an integer number (127756338).

Almost surely, 2^509873951 is an apocalyptic number.

509873951 is a deficient number, since it is larger than the sum of its proper divisors (1151401).

509873951 is a wasteful number, since it uses less digits than its factorization.

509873951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151400.

The product of its (nonzero) digits is 340200, while the sum is 47.

The square root of 509873951 is about 22580.3886370452. The cubic root of 509873951 is about 798.8911465777.

The spelling of 509873951 in words is "five hundred nine million, eight hundred seventy-three thousand, nine hundred fifty-one".