1913620945 has 16 divisors (see below), whose sum is σ = 2363323968. Its totient is φ = 1486416960.

The previous prime is 1913620939. The next prime is 1913620949. The reversal of 1913620945 is 5490263191.

It is not a de Polignac number, because 1913620945 - 2¹¹ = 1913618897 is a prime.

It is a super-2 number, since 2×1913620945² = 7323890242285386050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1913620898 and 1913620907.

It is not an unprimeable number, because it can be changed into a prime (1913620949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80302 + ... + 101368.

It is an arithmetic number, because the mean of its divisors is an integer number (147707748).

Almost surely, 2^1913620945 is an apocalyptic number.

It is an amenable number.

1913620945 is a deficient number, since it is larger than the sum of its proper divisors (449703023).

1913620945 is a wasteful number, since it uses less digits than its factorization.

1913620945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21600.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 1913620945 is about 43744.9533660741. The cubic root of 1913620945 is about 1241.5150024406.

The spelling of 1913620945 in words is "one billion, nine hundred thirteen million, six hundred twenty thousand, nine hundred forty-five".