1940263561 has 2 divisors, whose sum is σ = 1940263562. Its totient is φ = 1940263560.

The previous prime is 1940263543. The next prime is 1940263607. The reversal of 1940263561 is 1653620491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1899303561 + 40960000 = 43581^2 + 6400^2 .

It is a cyclic number.

It is not a de Polignac number, because 1940263561 - 2²³ = 1931874953 is a prime.

It is a super-2 number, since 2×1940263561² = 7529245372288801442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1940263561.

It is not a weakly prime, because it can be changed into another prime (1940263511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 970131780 + 970131781.

It is an arithmetic number, because the mean of its divisors is an integer number (970131781).

Almost surely, 2^1940263561 is an apocalyptic number.

It is an amenable number.

1940263561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1940263561 is an equidigital number, since it uses as much as digits as its factorization.

1940263561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 1940263561 is about 44048.4229116094. The cubic root of 1940263561 is about 1247.2501815814.

The spelling of 1940263561 in words is "one billion, nine hundred forty million, two hundred sixty-three thousand, five hundred sixty-one".