1201251720 has 32 divisors (see below), whose sum is σ = 3603755520. Its totient is φ = 320333760.

The previous prime is 1201251713. The next prime is 1201251721. The reversal of 1201251720 is 271521021.

It is not an unprimeable number, because it can be changed into a prime (1201251721) 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, 5005096 + ... + 5005335.

It is an arithmetic number, because the mean of its divisors is an integer number (112617360).

Almost surely, 2^1201251720 is an apocalyptic number.

1201251720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201251720 is an abundant number, since it is smaller than the sum of its proper divisors (2402503800).

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

1201251720 is a wasteful number, since it uses less digits than its factorization.

1201251720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10010445 (or 10010441 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 1201251720 is about 34659.0784643793. The cubic root of 1201251720 is about 1063.0279271711.

Adding to 1201251720 its reverse (271521021), we get a palindrome (1472772741).

The spelling of 1201251720 in words is "one billion, two hundred one million, two hundred fifty-one thousand, seven hundred twenty".