1203784561 has 16 divisors (see below), whose sum is σ = 1390970880. Its totient is φ = 1020436560.

The previous prime is 1203784537. The next prime is 1203784573. The reversal of 1203784561 is 1654873021.

It is a cyclic number.

It is not a de Polignac number, because 1203784561 - 2¹⁷ = 1203653489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1203784561.

It is not an unprimeable number, because it can be changed into a prime (1203784531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 642456 + ... + 644326.

It is an arithmetic number, because the mean of its divisors is an integer number (86935680).

Almost surely, 2^1203784561 is an apocalyptic number.

It is an amenable number.

1203784561 is a deficient number, since it is larger than the sum of its proper divisors (187186319).

1203784561 is a wasteful number, since it uses less digits than its factorization.

1203784561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2844.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 1203784561 is about 34695.5985825292. The cubic root of 1203784561 is about 1063.7745346529.

The spelling of 1203784561 in words is "one billion, two hundred three million, seven hundred eighty-four thousand, five hundred sixty-one".