1201001256 has 448 divisors, whose sum is σ = 4348216320. Its totient is φ = 302330880.

The previous prime is 1201001251. The next prime is 1201001257. The reversal of 1201001256 is 6521001021.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201001251) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 16452036 + ... + 16452108.

It is an arithmetic number, because the mean of its divisors is an integer number (9705840).

Almost surely, 2^1201001256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1201001256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2174108160).

1201001256 is an abundant number, since it is smaller than the sum of its proper divisors (3147215064).

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

1201001256 is a wasteful number, since it uses less digits than its factorization.

1201001256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148 (or 129 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1201001256 is about 34655.4650235717. The cubic root of 1201001256 is about 1062.9540407050.

Adding to 1201001256 its reverse (6521001021), we get a palindrome (7722002277).

The spelling of 1201001256 in words is "one billion, two hundred one million, one thousand, two hundred fifty-six".