1206135331 has 4 divisors (see below), whose sum is σ = 1206216592. Its totient is φ = 1206054072.

The previous prime is 1206135323. The next prime is 1206135347. The reversal of 1206135331 is 1335316021.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1206135331 - 2³ = 1206135323 is a prime.

It is a super-2 number, since 2×1206135331² = 2909524873372959122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1206135296 and 1206135305.

It is not an unprimeable number, because it can be changed into a prime (1206135131) 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, 11316 + ... + 50401.

It is an arithmetic number, because the mean of its divisors is an integer number (301554148).

Almost surely, 2^1206135331 is an apocalyptic number.

1206135331 is a deficient number, since it is larger than the sum of its proper divisors (81261).

1206135331 is an equidigital number, since it uses as much as digits as its factorization.

1206135331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81260.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 1206135331 is about 34729.4591233437. The cubic root of 1206135331 is about 1064.4665364479.

The spelling of 1206135331 in words is "one billion, two hundred six million, one hundred thirty-five thousand, three hundred thirty-one".