1201687056 has 40 divisors (see below), whose sum is σ = 3449288160. Its totient is φ = 400562208.

The previous prime is 1201687051. The next prime is 1201687057. The reversal of 1201687056 is 6507861021.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1201687056.

It is not an unprimeable number, because it can be changed into a prime (1201687051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1390410 + ... + 1391273.

It is an arithmetic number, because the mean of its divisors is an integer number (86232204).

Almost surely, 2^1201687056 is an apocalyptic number.

1201687056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1201687056 is an abundant number, since it is smaller than the sum of its proper divisors (2247601104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1201687056 is a wasteful number, since it uses less digits than its factorization.

1201687056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2781700 (or 2781688 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 1201687056 is about 34665.3581547919. The cubic root of 1201687056 is about 1063.1563261363.

The spelling of 1201687056 in words is "one billion, two hundred one million, six hundred eighty-seven thousand, fifty-six".