1611401213 has 4 divisors (see below), whose sum is σ = 1615792320. Its totient is φ = 1607010108.

The previous prime is 1611401149. The next prime is 1611401237. The reversal of 1611401213 is 3121041161.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1611401213 - 2⁶ = 1611401149 is a prime.

It is a super-2 number, since 2×1611401213² = 5193227738515742738, which contains 22 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 (1611401293) 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, 2195003 + ... + 2195736.

It is an arithmetic number, because the mean of its divisors is an integer number (403948080).

Almost surely, 2^1611401213 is an apocalyptic number.

It is an amenable number.

1611401213 is a deficient number, since it is larger than the sum of its proper divisors (4391107).

1611401213 is an equidigital number, since it uses as much as digits as its factorization.

1611401213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4391106.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1611401213 is about 40142.2621808986. The cubic root of 1611401213 is about 1172.3786349861.

Adding to 1611401213 its reverse (3121041161), we get a palindrome (4732442374).

The spelling of 1611401213 in words is "one billion, six hundred eleven million, four hundred one thousand, two hundred thirteen".