820251535 has 8 divisors (see below), whose sum is σ = 1008309456. Its totient is φ = 640196160.

The previous prime is 820251517. The next prime is 820251577. The reversal of 820251535 is 535152028.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 820251535 - 2⁹ = 820251023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 820251497 and 820251506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2000409 + ... + 2000818.

It is an arithmetic number, because the mean of its divisors is an integer number (126038682).

Almost surely, 2^820251535 is an apocalyptic number.

820251535 is a deficient number, since it is larger than the sum of its proper divisors (188057921).

820251535 is a wasteful number, since it uses less digits than its factorization.

820251535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4001273.

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 820251535 is about 28640.0337814047. The cubic root of 820251535 is about 936.0858575240.

The spelling of 820251535 in words is "eight hundred twenty million, two hundred fifty-one thousand, five hundred thirty-five".