1213015155 has 16 divisors (see below), whose sum is σ = 2117263104. Its totient is φ = 588128480.

The previous prime is 1213015117. The next prime is 1213015207. The reversal of 1213015155 is 5515103121.

It is not a de Polignac number, because 1213015155 - 2²¹ = 1210918003 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3675639 + ... + 3675968.

It is an arithmetic number, because the mean of its divisors is an integer number (132328944).

Almost surely, 2^1213015155 is an apocalyptic number.

1213015155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1213015155 is a deficient number, since it is larger than the sum of its proper divisors (904247949).

1213015155 is a wasteful number, since it uses less digits than its factorization.

1213015155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7351626.

The product of its (nonzero) digits is 750, while the sum is 24.

The square root of 1213015155 is about 34828.3671021195. The cubic root of 1213015155 is about 1066.4866144116.

Adding to 1213015155 its reverse (5515103121), we get a palindrome (6728118276).

The spelling of 1213015155 in words is "one billion, two hundred thirteen million, fifteen thousand, one hundred fifty-five".