1855263901 has 2 divisors, whose sum is σ = 1855263902. Its totient is φ = 1855263900.

The previous prime is 1855263889. The next prime is 1855263923. The reversal of 1855263901 is 1093625581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1795216900 + 60047001 = 42370^2 + 7749^2 .

It is a cyclic number.

It is not a de Polignac number, because 1855263901 - 2¹³ = 1855255709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1855263931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 927631950 + 927631951.

It is an arithmetic number, because the mean of its divisors is an integer number (927631951).

Almost surely, 2^1855263901 is an apocalyptic number.

It is an amenable number.

1855263901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1855263901 is an equidigital number, since it uses as much as digits as its factorization.

1855263901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 1855263901 is about 43072.7744752994. The cubic root of 1855263901 is about 1228.7642426029.

The spelling of 1855263901 in words is "one billion, eight hundred fifty-five million, two hundred sixty-three thousand, nine hundred one".