1949772209781 has 32 divisors (see below), whose sum is σ = 2846863438848. Its totient is φ = 1177173123840.

The previous prime is 1949772209741. The next prime is 1949772209783. The reversal of 1949772209781 is 1879022779491.

It is not a de Polignac number, because 1949772209781 - 2⁹ = 1949772209269 is a prime.

It is a super-2 number, since 2×1949772209781² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1949772209783) 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, 13126776 + ... + 13274478.

It is an arithmetic number, because the mean of its divisors is an integer number (88964482464).

Almost surely, 2^{1949772209781} is an apocalyptic number.

1949772209781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1949772209781 is a deficient number, since it is larger than the sum of its proper divisors (897091229067).

1949772209781 is a wasteful number, since it uses less digits than its factorization.

1949772209781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149241.

The product of its (nonzero) digits is 32006016, while the sum is 66.

The spelling of 1949772209781 in words is "one trillion, nine hundred forty-nine billion, seven hundred seventy-two million, two hundred nine thousand, seven hundred eighty-one".