861520354 has 4 divisors (see below), whose sum is σ = 1292280534. Its totient is φ = 430760176.

The previous prime is 861520343. The next prime is 861520381. The reversal of 861520354 is 453025168.

861520354 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 858197025 + 3323329 = 29295^2 + 1823^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215380087 + ... + 215380090.

Almost surely, 2^861520354 is an apocalyptic number.

861520354 is a deficient number, since it is larger than the sum of its proper divisors (430760180).

861520354 is a wasteful number, since it uses less digits than its factorization.

861520354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430760179.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 861520354 is about 29351.6669714004. Note that the first 3 decimals coincide. The cubic root of 861520354 is about 951.5286024177.

The spelling of 861520354 in words is "eight hundred sixty-one million, five hundred twenty thousand, three hundred fifty-four".