1361615989 has 2 divisors, whose sum is σ = 1361615990. Its totient is φ = 1361615988.

The previous prime is 1361615933. The next prime is 1361615993. The reversal of 1361615989 is 9895161631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1257269764 + 104346225 = 35458^2 + 10215^2 .

It is a cyclic number.

It is not a de Polignac number, because 1361615989 - 2¹⁵ = 1361583221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1361615389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 680807994 + 680807995.

It is an arithmetic number, because the mean of its divisors is an integer number (680807995).

Almost surely, 2^1361615989 is an apocalyptic number.

It is an amenable number.

1361615989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1361615989 is an equidigital number, since it uses as much as digits as its factorization.

1361615989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 49.

The square root of 1361615989 is about 36900.0811516723. The cubic root of 1361615989 is about 1108.3703025011.

The spelling of 1361615989 in words is "one billion, three hundred sixty-one million, six hundred fifteen thousand, nine hundred eighty-nine".