1900952561 has 2 divisors, whose sum is σ = 1900952562. Its totient is φ = 1900952560.

The previous prime is 1900952551. The next prime is 1900952567. The reversal of 1900952561 is 1652590091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1589218225 + 311734336 = 39865^2 + 17656^2 .

It is an emirp because it is prime and its reverse (1652590091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1900952561 - 2⁶ = 1900952497 is a prime.

It is a super-2 number, since 2×1900952561² = 7227241278344917442, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1900952567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 950476280 + 950476281.

It is an arithmetic number, because the mean of its divisors is an integer number (950476281).

Almost surely, 2^1900952561 is an apocalyptic number.

It is an amenable number.

1900952561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1900952561 is an equidigital number, since it uses as much as digits as its factorization.

1900952561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24300, while the sum is 38.

The square root of 1900952561 is about 43599.9146902835. The cubic root of 1900952561 is about 1238.7692785884.

The spelling of 1900952561 in words is "one billion, nine hundred million, nine hundred fifty-two thousand, five hundred sixty-one".