1861687051 has 32 divisors (see below), whose sum is σ = 2447953920. Its totient is φ = 1376870400.

The previous prime is 1861687043. The next prime is 1861687067. The reversal of 1861687051 is 1507861681.

It is a cyclic number.

It is not a de Polignac number, because 1861687051 - 2³ = 1861687043 is a prime.

It is a super-2 number, since 2×1861687051² = 6931757351722153202, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1861686989 and 1861687007.

It is not an unprimeable number, because it can be changed into a prime (1861687951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56811 + ... + 83371.

It is an arithmetic number, because the mean of its divisors is an integer number (76498560).

Almost surely, 2^1861687051 is an apocalyptic number.

1861687051 is a deficient number, since it is larger than the sum of its proper divisors (586266869).

1861687051 is a wasteful number, since it uses less digits than its factorization.

1861687051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26635.

The product of its (nonzero) digits is 80640, while the sum is 43.

The square root of 1861687051 is about 43147.2716518669. The cubic root of 1861687051 is about 1230.1806531758.

The spelling of 1861687051 in words is "one billion, eight hundred sixty-one million, six hundred eighty-seven thousand, fifty-one".