1361142997 has 4 divisors (see below), whose sum is σ = 1363408396. Its totient is φ = 1358877600.

The previous prime is 1361142977. The next prime is 1361143037. The reversal of 1361142997 is 7992411631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7992411631 = 1163 ⋅6872237.

It can be written as a sum of positive squares in 2 ways, for example, as 1221572401 + 139570596 = 34951^2 + 11814^2 .

It is a cyclic number.

It is not a de Polignac number, because 1361142997 - 2¹⁵ = 1361110229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1361142977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1131798 + ... + 1132999.

It is an arithmetic number, because the mean of its divisors is an integer number (340852099).

Almost surely, 2^1361142997 is an apocalyptic number.

It is an amenable number.

1361142997 is a deficient number, since it is larger than the sum of its proper divisors (2265399).

1361142997 is an equidigital number, since it uses as much as digits as its factorization.

1361142997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2265398.

The product of its digits is 81648, while the sum is 43.

The square root of 1361142997 is about 36893.6715033893. The cubic root of 1361142997 is about 1108.2419474177.

The spelling of 1361142997 in words is "one billion, three hundred sixty-one million, one hundred forty-two thousand, nine hundred ninety-seven".