2051387687 has 16 divisors (see below), whose sum is σ = 2263023360. Its totient is φ = 1850853312.

The previous prime is 2051387683. The next prime is 2051387711. The reversal of 2051387687 is 7867831502.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2051387687 - 2² = 2051387683 is a prime.

It is a super-3 number, since 3×2051387687³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051387683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91748 + ... + 111894.

It is an arithmetic number, because the mean of its divisors is an integer number (141438960).

Almost surely, 2^2051387687 is an apocalyptic number.

2051387687 is a deficient number, since it is larger than the sum of its proper divisors (211635673).

2051387687 is a wasteful number, since it uses less digits than its factorization.

2051387687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20422.

The product of its (nonzero) digits is 564480, while the sum is 47.

The square root of 2051387687 is about 45292.2475375201. The cubic root of 2051387687 is about 1270.6206665109.

The spelling of 2051387687 in words is "two billion, fifty-one million, three hundred eighty-seven thousand, six hundred eighty-seven".