1951563945 has 16 divisors (see below), whose sum is σ = 3175427520. Its totient is φ = 1023192384.

The previous prime is 1951563937. The next prime is 1951563947. The reversal of 1951563945 is 5493651591.

It is not a de Polignac number, because 1951563945 - 2³ = 1951563937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1951563894 and 1951563903.

It is not an unprimeable number, because it can be changed into a prime (1951563947) 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, 1101694 + ... + 1103463.

It is an arithmetic number, because the mean of its divisors is an integer number (198464220).

Almost surely, 2^1951563945 is an apocalyptic number.

1951563945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1951563945 is a deficient number, since it is larger than the sum of its proper divisors (1223863575).

1951563945 is a wasteful number, since it uses less digits than its factorization.

1951563945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2205224.

The product of its digits is 729000, while the sum is 48.

The square root of 1951563945 is about 44176.5089725297. The cubic root of 1951563945 is about 1249.6668861694. Note that the first 3 decimals are identical.

The spelling of 1951563945 in words is "one billion, nine hundred fifty-one million, five hundred sixty-three thousand, nine hundred forty-five".