1211315155 has 8 divisors (see below), whose sum is σ = 1453822992. Its totient is φ = 968888928.

The previous prime is 1211315107. The next prime is 1211315191. The reversal of 1211315155 is 5515131121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211315155 - 2²³ = 1202926547 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19272 + ... + 52858.

It is an arithmetic number, because the mean of its divisors is an integer number (181727874).

Almost surely, 2^1211315155 is an apocalyptic number.

1211315155 is a deficient number, since it is larger than the sum of its proper divisors (242507837).

1211315155 is an equidigital number, since it uses as much as digits as its factorization.

1211315155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40805.

The product of its digits is 750, while the sum is 25.

The square root of 1211315155 is about 34803.9531519050. The cubic root of 1211315155 is about 1065.9881664291.

Adding to 1211315155 its reverse (5515131121), we get a palindrome (6726446276).

The spelling of 1211315155 in words is "one billion, two hundred eleven million, three hundred fifteen thousand, one hundred fifty-five".