1913499945 has 24 divisors (see below), whose sum is σ = 3790552896. Its totient is φ = 874742688.

The previous prime is 1913499941. The next prime is 1913499949. The reversal of 1913499945 is 5499943191.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1913499941) and next prime (1913499949).

It is not a de Polignac number, because 1913499945 - 2² = 1913499941 is a prime.

It is a super-2 number, since 2×1913499945² = 7322964079030006050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1913499891 and 1913499900.

It is not an unprimeable number, because it can be changed into a prime (1913499941) 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, 3036987 + ... + 3037616.

It is an arithmetic number, because the mean of its divisors is an integer number (157939704).

Almost surely, 2^1913499945 is an apocalyptic number.

1913499945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1913499945 is a deficient number, since it is larger than the sum of its proper divisors (1877052951).

1913499945 is a wasteful number, since it uses less digits than its factorization.

1913499945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6074621 (or 6074618 counting only the distinct ones).

The product of its digits is 1574640, while the sum is 54.

The square root of 1913499945 is about 43743.5703275350. The cubic root of 1913499945 is about 1241.4888345133.

The spelling of 1913499945 in words is "one billion, nine hundred thirteen million, four hundred ninety-nine thousand, nine hundred forty-five".