1139539541 has 12 divisors (see below), whose sum is σ = 1327496940. Its totient is φ = 975340800.

The previous prime is 1139539537. The next prime is 1139539567. The reversal of 1139539541 is 1459359311.

It can be written as a sum of positive squares in 2 ways, for example, as 162664516 + 976875025 = 12754^2 + 31255^2 .

It is not a de Polignac number, because 1139539541 - 2² = 1139539537 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1139539501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18341 + ... + 51141.

It is an arithmetic number, because the mean of its divisors is an integer number (110624745).

Almost surely, 2^1139539541 is an apocalyptic number.

It is an amenable number.

1139539541 is a deficient number, since it is larger than the sum of its proper divisors (187957399).

1139539541 is an equidigital number, since it uses as much as digits as its factorization.

1139539541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33524 (or 33517 counting only the distinct ones).

The product of its digits is 72900, while the sum is 41.

The square root of 1139539541 is about 33757.0665342829. The cubic root of 1139539541 is about 1044.5032600168.

The spelling of 1139539541 in words is "one billion, one hundred thirty-nine million, five hundred thirty-nine thousand, five hundred forty-one".