1991530294435 has 16 divisors (see below), whose sum is σ = 2607229013760. Its totient is φ = 1448310774240.

The previous prime is 1991530294417. The next prime is 1991530294459. The reversal of 1991530294435 is 5344920351991.

It is not a de Polignac number, because 1991530294435 - 2¹¹ = 1991530292387 is a prime.

It is a super-3 number, since 3×1991530294435³ (a number of 38 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148456 + ... + 2001274.

It is an arithmetic number, because the mean of its divisors is an integer number (162951813360).

Almost surely, 2^{1991530294435} is an apocalyptic number.

1991530294435 is a deficient number, since it is larger than the sum of its proper divisors (615698719325).

1991530294435 is a wasteful number, since it uses less digits than its factorization.

1991530294435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1872378.

The product of its (nonzero) digits is 5248800, while the sum is 55.

The spelling of 1991530294435 in words is "one trillion, nine hundred ninety-one billion, five hundred thirty million, two hundred ninety-four thousand, four hundred thirty-five".