2051578731 has 16 divisors (see below), whose sum is σ = 2763341568. Its totient is φ = 1353789600.

The previous prime is 2051578721. The next prime is 2051578741. The reversal of 2051578731 is 1378751502.

It is an interprime number because it is at equal distance from previous prime (2051578721) and next prime (2051578741).

It is not a de Polignac number, because 2051578731 - 2¹⁹ = 2051054443 is a prime.

It is a super-2 number, since 2×2051578731² = 8417950578983140722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2051578731.

It is not an unprimeable number, because it can be changed into a prime (2051578721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 557026 + ... + 560696.

It is an arithmetic number, because the mean of its divisors is an integer number (172708848).

Almost surely, 2^2051578731 is an apocalyptic number.

2051578731 is a deficient number, since it is larger than the sum of its proper divisors (711762837).

2051578731 is a wasteful number, since it uses less digits than its factorization.

2051578731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5522.

The product of its (nonzero) digits is 58800, while the sum is 39.

The square root of 2051578731 is about 45294.3565027697. The cubic root of 2051578731 is about 1270.6601092291.

The spelling of 2051578731 in words is "two billion, fifty-one million, five hundred seventy-eight thousand, seven hundred thirty-one".