1213011405 has 24 divisors (see below), whose sum is σ = 2121851160. Its totient is φ = 641001600.

The previous prime is 1213011389. The next prime is 1213011407. The reversal of 1213011405 is 5041103121.

It can be written as a sum of positive squares in 4 ways, for example, as 64208169 + 1148803236 = 8013^2 + 33894^2 .

It is not a de Polignac number, because 1213011405 - 2⁴ = 1213011389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213011407) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 118746 + ... + 128555.

It is an arithmetic number, because the mean of its divisors is an integer number (88410465).

Almost surely, 2^1213011405 is an apocalyptic number.

1213011405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1213011405 is a deficient number, since it is larger than the sum of its proper divisors (908839755).

1213011405 is a wasteful number, since it uses less digits than its factorization.

1213011405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247421 (or 247418 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1213011405 is about 34828.3132666513. The cubic root of 1213011405 is about 1066.4855154067.

Adding to 1213011405 its reverse (5041103121), we get a palindrome (6254114526).

The spelling of 1213011405 in words is "one billion, two hundred thirteen million, eleven thousand, four hundred five".