861021351 has 6 divisors (see below), whose sum is σ = 1243697520. Its totient is φ = 574014228.

The previous prime is 861021323. The next prime is 861021407. The reversal of 861021351 is 153120168.

It is not a de Polignac number, because 861021351 - 2¹³ = 861013159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861021851) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 47834511 + ... + 47834528.

It is an arithmetic number, because the mean of its divisors is an integer number (207282920).

Almost surely, 2^861021351 is an apocalyptic number.

861021351 is a deficient number, since it is larger than the sum of its proper divisors (382676169).

861021351 is a wasteful number, since it uses less digits than its factorization.

861021351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95669045 (or 95669042 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 861021351 is about 29343.1653200537. The cubic root of 861021351 is about 951.3448546484.

The spelling of 861021351 in words is "eight hundred sixty-one million, twenty-one thousand, three hundred fifty-one".