1201355656 has 16 divisors (see below), whose sum is σ = 2253200400. Its totient is φ = 600502224.

The previous prime is 1201355633. The next prime is 1201355657. The reversal of 1201355656 is 6565531021.

It is not an unprimeable number, because it can be changed into a prime (1201355657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9831 + ... + 49993.

It is an arithmetic number, because the mean of its divisors is an integer number (140825025).

Almost surely, 2^1201355656 is an apocalyptic number.

It is an amenable number.

1201355656 is a deficient number, since it is larger than the sum of its proper divisors (1051844744).

1201355656 is a wasteful number, since it uses less digits than its factorization.

1201355656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43908 (or 43904 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 1201355656 is about 34660.5778370759. The cubic root of 1201355656 is about 1063.0585851041.

Adding to 1201355656 its reverse (6565531021), we get a palindrome (7766886677).

The spelling of 1201355656 in words is "one billion, two hundred one million, three hundred fifty-five thousand, six hundred fifty-six".