1202055561 has 12 divisors (see below), whose sum is σ = 1984345792. Its totient is φ = 686888856.

The previous prime is 1202055541. The next prime is 1202055581. The reversal of 1202055561 is 1655502021.

It is an interprime number because it is at equal distance from previous prime (1202055541) and next prime (1202055581).

It is not a de Polignac number, because 1202055561 - 2⁷ = 1202055433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1202055511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9540061 + ... + 9540186.

Almost surely, 2^1202055561 is an apocalyptic number.

It is an amenable number.

1202055561 is a deficient number, since it is larger than the sum of its proper divisors (782290231).

1202055561 is a wasteful number, since it uses less digits than its factorization.

1202055561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19080260 (or 19080257 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 1202055561 is about 34670.6729239569. The cubic root of 1202055561 is about 1063.2649895857.

Adding to 1202055561 its reverse (1655502021), we get a palindrome (2857557582).

The spelling of 1202055561 in words is "one billion, two hundred two million, fifty-five thousand, five hundred sixty-one".