1513661 has 2 divisors, whose sum is σ = 1513662. Its totient is φ = 1513660.

The previous prime is 1513657. The next prime is 1513667. The reversal of 1513661 is 1663151.

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., 988036 + 525625 = 994^2 + 725^2 .

It is a cyclic number.

It is not a de Polignac number, because 1513661 - 2² = 1513657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1513667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 756830 + 756831.

It is an arithmetic number, because the mean of its divisors is an integer number (756831).

2^1513661 is an apocalyptic number.

It is an amenable number.

1513661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1513661 is an equidigital number, since it uses as much as digits as its factorization.

1513661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 23.

The square root of 1513661 is about 1230.3093107020. The cubic root of 1513661 is about 114.8178844043.

The spelling of 1513661 in words is "one million, five hundred thirteen thousand, six hundred sixty-one".