1201650561 has 24 divisors (see below), whose sum is σ = 1771960320. Its totient is φ = 784514016.

The previous prime is 1201650557. The next prime is 1201650563. The reversal of 1201650561 is 1650561021.

It is a happy number.

1201650561 is a `hidden beast` number, since 1 + 2 + 0 + 1 + 650 + 5 + 6 + 1 = 666.

It is not a de Polignac number, because 1201650561 - 2² = 1201650557 is a prime.

It is a super-2 number, since 2×1201650561² = 2887928141503229442, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1201650563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 98560 + ... + 110078.

It is an arithmetic number, because the mean of its divisors is an integer number (73831680).

Almost surely, 2^1201650561 is an apocalyptic number.

It is an amenable number.

1201650561 is a deficient number, since it is larger than the sum of its proper divisors (570309759).

1201650561 is a wasteful number, since it uses less digits than its factorization.

1201650561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11765 (or 11762 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 1201650561 is about 34664.8317607341. The cubic root of 1201650561 is about 1063.1455634111.

The spelling of 1201650561 in words is "one billion, two hundred one million, six hundred fifty thousand, five hundred sixty-one".