861961151 has 8 divisors (see below), whose sum is σ = 874475760. Its totient is φ = 849465792.

The previous prime is 861961103. The next prime is 861961157. The reversal of 861961151 is 151169168.

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

It is a cyclic number.

It is not a de Polignac number, because 861961151 - 2¹⁴ = 861944767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861961157) 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 7 ways as a sum of consecutive naturals, for example, 102461 + ... + 110553.

It is an arithmetic number, because the mean of its divisors is an integer number (109309470).

Almost surely, 2^861961151 is an apocalyptic number.

861961151 is a deficient number, since it is larger than the sum of its proper divisors (12514609).

861961151 is a wasteful number, since it uses less digits than its factorization.

861961151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9625.

The product of its digits is 12960, while the sum is 38.

The square root of 861961151 is about 29359.1749032564. The cubic root of 861961151 is about 951.6908579921.

The spelling of 861961151 in words is "eight hundred sixty-one million, nine hundred sixty-one thousand, one hundred fifty-one".