1211453013 has 4 divisors (see below), whose sum is σ = 1615270688. Its totient is φ = 807635340.

The previous prime is 1211453003. The next prime is 1211453027. The reversal of 1211453013 is 3103541121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3103541121 = 3 ⋅1034513707.

It is not a de Polignac number, because 1211453013 - 2⁵ = 1211452981 is a prime.

It is a super-3 number, since 3×1211453013³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211453003) 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, 201908833 + ... + 201908838.

It is an arithmetic number, because the mean of its divisors is an integer number (403817672).

Almost surely, 2^1211453013 is an apocalyptic number.

It is an amenable number.

1211453013 is a deficient number, since it is larger than the sum of its proper divisors (403817675).

1211453013 is an equidigital number, since it uses as much as digits as its factorization.

1211453013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403817674.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1211453013 is about 34805.9335889730. The cubic root of 1211453013 is about 1066.0286044113.

Adding to 1211453013 its reverse (3103541121), we get a palindrome (4314994134).

The spelling of 1211453013 in words is "one billion, two hundred eleven million, four hundred fifty-three thousand, thirteen".