1985437801 has 2 divisors, whose sum is σ = 1985437802. Its totient is φ = 1985437800.

The previous prime is 1985437793. The next prime is 1985437819. The reversal of 1985437801 is 1087345891.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1394947801 + 590490000 = 37349^2 + 24300^2 .

It is a cyclic number.

It is not a de Polignac number, because 1985437801 - 2³ = 1985437793 is a prime.

It is not a weakly prime, because it can be changed into another prime (1985437841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992718900 + 992718901.

It is an arithmetic number, because the mean of its divisors is an integer number (992718901).

Almost surely, 2^1985437801 is an apocalyptic number.

It is an amenable number.

1985437801 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985437801 is an equidigital number, since it uses as much as digits as its factorization.

1985437801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 46.

The square root of 1985437801 is about 44558.2517722587. The cubic root of 1985437801 is about 1256.8557280000.

The spelling of 1985437801 in words is "one billion, nine hundred eighty-five million, four hundred thirty-seven thousand, eight hundred one".