1213013551 has 4 divisors (see below), whose sum is σ = 1213530552. Its totient is φ = 1212496552.

The previous prime is 1213013533. The next prime is 1213013573. The reversal of 1213013551 is 1553103121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1213013551 - 2⁵ = 1213013519 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 (1213013651) 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, 254965 + ... + 259678.

It is an arithmetic number, because the mean of its divisors is an integer number (303382638).

Almost surely, 2^1213013551 is an apocalyptic number.

1213013551 is a deficient number, since it is larger than the sum of its proper divisors (517001).

1213013551 is an equidigital number, since it uses as much as digits as its factorization.

1213013551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517000.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 1213013551 is about 34828.3440749054. The cubic root of 1213013551 is about 1066.4861443308.

Adding to 1213013551 its reverse (1553103121), we get a palindrome (2766116672).

The spelling of 1213013551 in words is "one billion, two hundred thirteen million, thirteen thousand, five hundred fifty-one".