1904009961 has 8 divisors (see below), whose sum is σ = 2901348544. Its totient is φ = 1088005680.

The previous prime is 1904009959. The next prime is 1904009963. The reversal of 1904009961 is 1699004091.

It is an interprime number because it is at equal distance from previous prime (1904009959) and next prime (1904009963).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1904009961 - 2¹ = 1904009959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1904009963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45333550 + ... + 45333591.

It is an arithmetic number, because the mean of its divisors is an integer number (362668568).

Almost surely, 2^1904009961 is an apocalyptic number.

It is an amenable number.

1904009961 is a deficient number, since it is larger than the sum of its proper divisors (997338583).

1904009961 is an equidigital number, since it uses as much as digits as its factorization.

1904009961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90667151.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 1904009961 is about 43634.9625988152. The cubic root of 1904009961 is about 1239.4330483540.

The spelling of 1904009961 in words is "one billion, nine hundred four million, nine thousand, nine hundred sixty-one".