1293145491 has 32 divisors (see below), whose sum is σ = 2066042880. Its totient is φ = 710186400.

The previous prime is 1293145487. The next prime is 1293145519. The reversal of 1293145491 is 1945413921.

It is not a de Polignac number, because 1293145491 - 2² = 1293145487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1293145481) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30415 + ... + 59256.

It is an arithmetic number, because the mean of its divisors is an integer number (64563840).

Almost surely, 2^1293145491 is an apocalyptic number.

1293145491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1293145491 is a deficient number, since it is larger than the sum of its proper divisors (772897389).

1293145491 is a wasteful number, since it uses less digits than its factorization.

1293145491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89727.

The product of its digits is 38880, while the sum is 39.

The square root of 1293145491 is about 35960.3321870085. The cubic root of 1293145491 is about 1089.4713063230.

It can be divided in two parts, 1293145 and 491, that added together give a triangular number (1293636 = T₁₆₀₈).

The spelling of 1293145491 in words is "one billion, two hundred ninety-three million, one hundred forty-five thousand, four hundred ninety-one".