1081645949 has 4 divisors (see below), whose sum is σ = 1081766940. Its totient is φ = 1081524960.

The previous prime is 1081645937. The next prime is 1081645963. The reversal of 1081645949 is 9495461801.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 113316025 + 968329924 = 10645^2 + 31118^2 .

It is a cyclic number.

It is not a de Polignac number, because 1081645949 - 2¹² = 1081641853 is a prime.

It is a super-2 number, since 2×1081645949² = 2339915917976221202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081645979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45914 + ... + 65355.

It is an arithmetic number, because the mean of its divisors is an integer number (270441735).

Almost surely, 2^1081645949 is an apocalyptic number.

It is an amenable number.

1081645949 is a deficient number, since it is larger than the sum of its proper divisors (120991).

1081645949 is an equidigital number, since it uses as much as digits as its factorization.

1081645949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120990.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 1081645949 is about 32888.3862328330. The cubic root of 1081645949 is about 1026.5065133025.

It can be divided in two parts, 10816 and 45949, that added together give a palindrome (56765).

The spelling of 1081645949 in words is "one billion, eighty-one million, six hundred forty-five thousand, nine hundred forty-nine".