1901634389 has 4 divisors (see below), whose sum is σ = 1907379840. Its totient is φ = 1895888940.

The previous prime is 1901634353. The next prime is 1901634421. The reversal of 1901634389 is 9834361091.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1901634389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1901634349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2872229 + ... + 2872890.

It is an arithmetic number, because the mean of its divisors is an integer number (476844960).

Almost surely, 2^1901634389 is an apocalyptic number.

It is an amenable number.

1901634389 is a deficient number, since it is larger than the sum of its proper divisors (5745451).

1901634389 is an equidigital number, since it uses as much as digits as its factorization.

1901634389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5745450.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 1901634389 is about 43607.7331330121. The cubic root of 1901634389 is about 1238.9173669090.

The spelling of 1901634389 in words is "one billion, nine hundred one million, six hundred thirty-four thousand, three hundred eighty-nine".