1206955851 has 16 divisors (see below), whose sum is σ = 1704646944. Its totient is φ = 756990464.

The previous prime is 1206955847. The next prime is 1206955859. The reversal of 1206955851 is 1585596021.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1206955851 - 2² = 1206955847 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1206955859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209161 + ... + 214853.

It is an arithmetic number, because the mean of its divisors is an integer number (106540434).

Almost surely, 2^1206955851 is an apocalyptic number.

1206955851 is a deficient number, since it is larger than the sum of its proper divisors (497691093).

1206955851 is a wasteful number, since it uses less digits than its factorization.

1206955851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9870.

The product of its (nonzero) digits is 108000, while the sum is 42.

The square root of 1206955851 is about 34741.2701408570. The cubic root of 1206955851 is about 1064.7078631815.

The spelling of 1206955851 in words is "one billion, two hundred six million, nine hundred fifty-five thousand, eight hundred fifty-one".