240428191491 has 32 divisors (see below), whose sum is σ = 362136499200. Its totient is φ = 157625676000.

The previous prime is 240428191489. The next prime is 240428191499. The reversal of 240428191491 is 194191824042.

240428191491 is a `hidden beast` number, since 2 + 40 + 42 + 81 + 9 + 1 + 491 = 666.

It is not a de Polignac number, because 240428191491 - 2¹ = 240428191489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (240428191499) 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, 310845 + ... + 759921.

It is an arithmetic number, because the mean of its divisors is an integer number (11316765600).

Almost surely, 2^240428191491 is an apocalyptic number.

240428191491 is a deficient number, since it is larger than the sum of its proper divisors (121708307709).

240428191491 is a wasteful number, since it uses less digits than its factorization.

240428191491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449416 (or 449410 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 240428191491 in words is "two hundred forty billion, four hundred twenty-eight million, one hundred ninety-one thousand, four hundred ninety-one".