1213553101 has 2 divisors, whose sum is σ = 1213553102. Its totient is φ = 1213553100.

The previous prime is 1213553083. The next prime is 1213553147. The reversal of 1213553101 is 1013553121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 706177476 + 507375625 = 26574^2 + 22525^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213553101 - 2⁵ = 1213553069 is a prime.

It is a super-2 number, since 2×1213553101² = 2945422257893432402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213553171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606776550 + 606776551.

It is an arithmetic number, because the mean of its divisors is an integer number (606776551).

Almost surely, 2^1213553101 is an apocalyptic number.

It is an amenable number.

1213553101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213553101 is an equidigital number, since it uses as much as digits as its factorization.

1213553101 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1213553101 is about 34836.0890600538. The cubic root of 1213553101 is about 1066.6442456984.

The spelling of 1213553101 in words is "one billion, two hundred thirteen million, five hundred fifty-three thousand, one hundred one".