1201972011 has 4 divisors (see below), whose sum is σ = 1602629352. Its totient is φ = 801314672.

The previous prime is 1201972003. The next prime is 1201972049. The reversal of 1201972011 is 1102791021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1201972011 - 2³ = 1201972003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1201972081) 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, 200328666 + ... + 200328671.

It is an arithmetic number, because the mean of its divisors is an integer number (400657338).

Almost surely, 2^1201972011 is an apocalyptic number.

1201972011 is a deficient number, since it is larger than the sum of its proper divisors (400657341).

1201972011 is an equidigital number, since it uses as much as digits as its factorization.

1201972011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400657340.

The product of its (nonzero) digits is 252, while the sum is 24.

The square root of 1201972011 is about 34669.4679941876. The cubic root of 1201972011 is about 1063.2403546046.

The spelling of 1201972011 in words is "one billion, two hundred one million, nine hundred seventy-two thousand, eleven".