1913961229 has 4 divisors (see below), whose sum is σ = 1916363484. Its totient is φ = 1911558976.

The previous prime is 1913961209. The next prime is 1913961241. The reversal of 1913961229 is 9221693191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9221693191 = 8573 ⋅1075667.

It can be written as a sum of positive squares in 2 ways, for example, as 1260392004 + 653569225 = 35502^2 + 25565^2 .

It is a cyclic number.

It is not a de Polignac number, because 1913961229 - 2¹¹ = 1913959181 is a prime.

It is a super-2 number, since 2×1913961229² = 7326495172230380882, 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 (1913961209) 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, 1199932 + ... + 1201525.

It is an arithmetic number, because the mean of its divisors is an integer number (479090871).

Almost surely, 2^1913961229 is an apocalyptic number.

It is an amenable number.

1913961229 is a deficient number, since it is larger than the sum of its proper divisors (2402255).

1913961229 is an equidigital number, since it uses as much as digits as its factorization.

1913961229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2402254.

The product of its digits is 52488, while the sum is 43.

The square root of 1913961229 is about 43748.8426018335. The cubic root of 1913961229 is about 1241.5885876602.

The spelling of 1913961229 in words is "one billion, nine hundred thirteen million, nine hundred sixty-one thousand, two hundred twenty-nine".