1201655279 has 4 divisors (see below), whose sum is σ = 1310896680. Its totient is φ = 1092413880.

The previous prime is 1201655269. The next prime is 1201655293. The reversal of 1201655279 is 9725561021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9725561021 = 11 ⋅884141911.

It is a cyclic number.

It is not a de Polignac number, because 1201655279 - 2⁸ = 1201655023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201655239) 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, 54620684 + ... + 54620705.

It is an arithmetic number, because the mean of its divisors is an integer number (327724170).

Almost surely, 2^1201655279 is an apocalyptic number.

1201655279 is a deficient number, since it is larger than the sum of its proper divisors (109241401).

1201655279 is a wasteful number, since it uses less digits than its factorization.

1201655279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109241400.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 1201655279 is about 34664.8998123462. The cubic root of 1201655279 is about 1063.1469548068.

The spelling of 1201655279 in words is "one billion, two hundred one million, six hundred fifty-five thousand, two hundred seventy-nine".