861437 has 2 divisors, whose sum is σ = 861438. Its totient is φ = 861436.

The previous prime is 861433. The next prime is 861439. The reversal of 861437 is 734168.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 755161 + 106276 = 869^2 + 326^2 .

It is a cyclic number.

It is not a de Polignac number, because 861437 - 2² = 861433 is a prime.

Together with 861439, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430718 + 430719.

It is an arithmetic number, because the mean of its divisors is an integer number (430719).

2⁸⁶¹⁴³⁷ is an apocalyptic number.

It is an amenable number.

861437 is a deficient number, since it is larger than the sum of its proper divisors (1).

861437 is an equidigital number, since it uses as much as digits as its factorization.

861437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 29.

The square root of 861437 is about 928.1363046450. The cubic root of 861437 is about 95.1497913929.

The spelling of 861437 in words is "eight hundred sixty-one thousand, four hundred thirty-seven".