1291924545 has 16 divisors (see below), whose sum is σ = 2070764352. Its totient is φ = 687798080.

The previous prime is 1291924531. The next prime is 1291924547. The reversal of 1291924545 is 5454291921.

It is not a de Polignac number, because 1291924545 - 2⁹ = 1291924033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1291924497 and 1291924506.

It is not an unprimeable number, because it can be changed into a prime (1291924547) 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, 68046 + ... + 84935.

It is an arithmetic number, because the mean of its divisors is an integer number (129422772).

Almost surely, 2^1291924545 is an apocalyptic number.

1291924545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1291924545 is a deficient number, since it is larger than the sum of its proper divisors (778839807).

1291924545 is a wasteful number, since it uses less digits than its factorization.

1291924545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153552.

The product of its digits is 129600, while the sum is 42.

The square root of 1291924545 is about 35943.3518887708. The cubic root of 1291924545 is about 1089.1283172054.

The spelling of 1291924545 in words is "one billion, two hundred ninety-one million, nine hundred twenty-four thousand, five hundred forty-five".