1900498561 has 8 divisors (see below), whose sum is σ = 2167084584. Its totient is φ = 1651111680.

The previous prime is 1900498553. The next prime is 1900498637. The reversal of 1900498561 is 1658940091.

It can be written as a sum of positive squares in 4 ways, for example, as 782264961 + 1118233600 = 27969^2 + 33440^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1900498561 - 2³ = 1900498553 is a prime.

It is a super-2 number, since 2×1900498561² = 7223789560726141442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1900498511) 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, 4299550 + ... + 4299991.

It is an arithmetic number, because the mean of its divisors is an integer number (270885573).

Almost surely, 2^1900498561 is an apocalyptic number.

It is an amenable number.

1900498561 is a deficient number, since it is larger than the sum of its proper divisors (266586023).

1900498561 is a wasteful number, since it uses less digits than its factorization.

1900498561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8599571.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 1900498561 is about 43594.7079471809. The cubic root of 1900498561 is about 1238.6706532917.

The spelling of 1900498561 in words is "one billion, nine hundred million, four hundred ninety-eight thousand, five hundred sixty-one".