861625477 has 4 divisors (see below), whose sum is σ = 861762496. Its totient is φ = 861488460.

The previous prime is 861625459. The next prime is 861625481. The reversal of 861625477 is 774526168.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 861625477 - 2¹¹ = 861623429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861625417) 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, 58599 + ... + 71812.

It is an arithmetic number, because the mean of its divisors is an integer number (215440624).

Almost surely, 2^861625477 is an apocalyptic number.

It is an amenable number.

861625477 is a deficient number, since it is larger than the sum of its proper divisors (137019).

861625477 is a wasteful number, since it uses less digits than its factorization.

861625477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137018.

The product of its digits is 564480, while the sum is 46.

The square root of 861625477 is about 29353.4576668576. The cubic root of 861625477 is about 951.5673027892.

The spelling of 861625477 in words is "eight hundred sixty-one million, six hundred twenty-five thousand, four hundred seventy-seven".