871625477 has 2 divisors, whose sum is σ = 871625478. Its totient is φ = 871625476.

The previous prime is 871625473. The next prime is 871625507. The reversal of 871625477 is 774526178.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 698597761 + 173027716 = 26431^2 + 13154^2 .

It is a cyclic number.

It is not a de Polignac number, because 871625477 - 2² = 871625473 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (871625473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435812738 + 435812739.

It is an arithmetic number, because the mean of its divisors is an integer number (435812739).

Almost surely, 2^871625477 is an apocalyptic number.

It is an amenable number.

871625477 is a deficient number, since it is larger than the sum of its proper divisors (1).

871625477 is an equidigital number, since it uses as much as digits as its factorization.

871625477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 658560, while the sum is 47.

The square root of 871625477 is about 29523.3039648343. The cubic root of 871625477 is about 955.2344396704.

The spelling of 871625477 in words is "eight hundred seventy-one million, six hundred twenty-five thousand, four hundred seventy-seven".