861417145 has 8 divisors (see below), whose sum is σ = 1037991240. Its totient is φ = 686273280.

The previous prime is 861417143. The next prime is 861417197. The reversal of 861417145 is 541714168.

It can be written as a sum of positive squares in 4 ways, for example, as 153165376 + 708251769 = 12376^2 + 26613^2 .

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

It is not a de Polignac number, because 861417145 - 2¹ = 861417143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (861417143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 356230 + ... + 358639.

It is an arithmetic number, because the mean of its divisors is an integer number (129748905).

Almost surely, 2^861417145 is an apocalyptic number.

It is an amenable number.

861417145 is a deficient number, since it is larger than the sum of its proper divisors (176574095).

861417145 is a wasteful number, since it uses less digits than its factorization.

861417145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715115.

The product of its digits is 26880, while the sum is 37.

The square root of 861417145 is about 29349.9087732824. The cubic root of 861417145 is about 951.4906036105.

The spelling of 861417145 in words is "eight hundred sixty-one million, four hundred seventeen thousand, one hundred forty-five".