1860856649 has 2 divisors, whose sum is σ = 1860856650. Its totient is φ = 1860856648.

The previous prime is 1860856631. The next prime is 1860856687. The reversal of 1860856649 is 9466580681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1804125625 + 56731024 = 42475^2 + 7532^2 .

It is a cyclic number.

It is not a de Polignac number, because 1860856649 - 2¹⁶ = 1860791113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1860856649.

It is not a weakly prime, because it can be changed into another prime (1860856619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930428324 + 930428325.

It is an arithmetic number, because the mean of its divisors is an integer number (930428325).

Almost surely, 2^1860856649 is an apocalyptic number.

It is an amenable number.

1860856649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1860856649 is an equidigital number, since it uses as much as digits as its factorization.

1860856649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2488320, while the sum is 53.

The square root of 1860856649 is about 43137.6476989648. The cubic root of 1860856649 is about 1229.9977193868.

It can be divided in two parts, 18608 and 56649, that added together give a palindrome (75257).

The spelling of 1860856649 in words is "one billion, eight hundred sixty million, eight hundred fifty-six thousand, six hundred forty-nine".