1301581 has 2 divisors, whose sum is σ = 1301582. Its totient is φ = 1301580.

The previous prime is 1301561. The next prime is 1301591. The reversal of 1301581 is 1851031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1285956 + 15625 = 1134^2 + 125^2 .

It is a cyclic number.

It is not a de Polignac number, because 1301581 - 2⁷ = 1301453 is a prime.

It is a super-2 number, since 2×1301581² = 3388226199122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1301551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 650790 + 650791.

It is an arithmetic number, because the mean of its divisors is an integer number (650791).

2^1301581 is an apocalyptic number.

It is an amenable number.

1301581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1301581 is an equidigital number, since it uses as much as digits as its factorization.

1301581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 1301581 is about 1140.8685287972. The cubic root of 1301581 is about 109.1835137710.

It can be divided in two parts, 130 and 1581, that added together give a triangular number (1711 = T₅₈).

The spelling of 1301581 in words is "one million, three hundred one thousand, five hundred eighty-one".