1258661 has 2 divisors, whose sum is σ = 1258662. Its totient is φ = 1258660.

The previous prime is 1258657. The next prime is 1258667. The reversal of 1258661 is 1668521.

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., 1221025 + 37636 = 1105^2 + 194^2 .

It is an emirp because it is prime and its reverse (1668521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1258661 - 2² = 1258657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1258667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 629330 + 629331.

It is an arithmetic number, because the mean of its divisors is an integer number (629331).

2^1258661 is an apocalyptic number.

It is an amenable number.

1258661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1258661 is an equidigital number, since it uses as much as digits as its factorization.

1258661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 29.

The square root of 1258661 is about 1121.9006194846. The cubic root of 1258661 is about 107.9699562064.

The spelling of 1258661 in words is "one million, two hundred fifty-eight thousand, six hundred sixty-one".