1491044936251 has 16 divisors (see below), whose sum is σ = 1621735446240. Its totient is φ = 1362641011200.

The previous prime is 1491044936231. The next prime is 1491044936273. The reversal of 1491044936251 is 1526394401941.

It is a cyclic number.

It is not a de Polignac number, because 1491044936251 - 2²⁷ = 1490910718523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1491044936195 and 1491044936204.

It is not an unprimeable number, because it can be changed into a prime (1491044936221) 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, 42482956 + ... + 42518038.

It is an arithmetic number, because the mean of its divisors is an integer number (101358465390).

Almost surely, 2^{1491044936251} is an apocalyptic number.

1491044936251 is a deficient number, since it is larger than the sum of its proper divisors (130690509989).

1491044936251 is a wasteful number, since it uses less digits than its factorization.

1491044936251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67566.

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 1491044936251 in words is "one trillion, four hundred ninety-one billion, forty-four million, nine hundred thirty-six thousand, two hundred fifty-one".