2781139537 has 4 divisors (see below), whose sum is σ = 3033970416. Its totient is φ = 2528308660.

The previous prime is 2781139519. The next prime is 2781139541. The reversal of 2781139537 is 7359311872.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2781139537 - 2⁷ = 2781139409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2781139547) 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, 126415423 + ... + 126415444.

It is an arithmetic number, because the mean of its divisors is an integer number (758492604).

Almost surely, 2^2781139537 is an apocalyptic number.

It is an amenable number.

2781139537 is a deficient number, since it is larger than the sum of its proper divisors (252830879).

2781139537 is a wasteful number, since it uses less digits than its factorization.

2781139537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252830878.

The product of its digits is 317520, while the sum is 46.

The square root of 2781139537 is about 52736.5104742436. The cubic root of 2781139537 is about 1406.2879637303.

The spelling of 2781139537 in words is "two billion, seven hundred eighty-one million, one hundred thirty-nine thousand, five hundred thirty-seven".