661027 has 2 divisors, whose sum is σ = 661028. Its totient is φ = 661026.

The previous prime is 661019. The next prime is 661049. The reversal of 661027 is 720166.

It is an a-pointer prime, because the next prime (661049) can be obtained adding 661027 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661027 - 2³ = 661019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 660989 and 661007.

It is not a weakly prime, because it can be changed into another prime (661097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330513 + 330514.

It is an arithmetic number, because the mean of its divisors is an integer number (330514).

2⁶⁶¹⁰²⁷ is an apocalyptic number.

661027 is a deficient number, since it is larger than the sum of its proper divisors (1).

661027 is an equidigital number, since it uses as much as digits as its factorization.

661027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 661027 is about 813.0356695742. The cubic root of 661027 is about 87.1110134352. Note that the first 3 decimals are identical.

The spelling of 661027 in words is "six hundred sixty-one thousand, twenty-seven".