1951942897281 has 64 divisors (see below), whose sum is σ = 3028053754880. Its totient is φ = 1108146251520.

The previous prime is 1951942897271. The next prime is 1951942897313. The reversal of 1951942897281 is 1827982491591.

It is not a de Polignac number, because 1951942897281 - 2¹³ = 1951942889089 is a prime.

It is a super-2 number, since 2×1951942897281² (a number of 25 digits) contains 22 as substring.

It is the 1397120-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1951942897211) by changing a digit.

It is a nontrivial repunit in base 1397119.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10454115 + ... + 10639191.

It is an arithmetic number, because the mean of its divisors is an integer number (47313339920).

Almost surely, 2^{1951942897281} is an apocalyptic number.

It is an amenable number.

1951942897281 is a deficient number, since it is larger than the sum of its proper divisors (1076110857599).

1951942897281 is a wasteful number, since it uses less digits than its factorization.

1951942897281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185486.

The product of its digits is 26127360, while the sum is 66.

The spelling of 1951942897281 in words is "one trillion, nine hundred fifty-one billion, nine hundred forty-two million, eight hundred ninety-seven thousand, two hundred eighty-one".