861425645 has 4 divisors (see below), whose sum is σ = 1033710780. Its totient is φ = 689140512.

The previous prime is 861425641. The next prime is 861425651. The reversal of 861425645 is 546524168.

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

It can be written as a sum of positive squares in 2 ways, for example, as 582836164 + 278589481 = 24142^2 + 16691^2 .

It is a cyclic number.

It is not a de Polignac number, because 861425645 - 2² = 861425641 is a prime.

It is a super-3 number, since 3×861425645³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861425641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86142560 + ... + 86142569.

It is an arithmetic number, because the mean of its divisors is an integer number (258427695).

Almost surely, 2^861425645 is an apocalyptic number.

It is an amenable number.

861425645 is a deficient number, since it is larger than the sum of its proper divisors (172285135).

861425645 is a wasteful number, since it uses less digits than its factorization.

861425645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172285134.

The product of its digits is 230400, while the sum is 41.

The square root of 861425645 is about 29350.0535774639. The cubic root of 861425645 is about 951.4937331990.

The spelling of 861425645 in words is "eight hundred sixty-one million, four hundred twenty-five thousand, six hundred forty-five".