1261298977841 has 32 divisors (see below), whose sum is σ = 1473116682240. Its totient is φ = 1057661547264.

The previous prime is 1261298977837. The next prime is 1261298977871. The reversal of 1261298977841 is 1487798921621.

It is not a de Polignac number, because 1261298977841 - 2² = 1261298977837 is a prime.

It is a super-3 number, since 3×1261298977841³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1261298977801) 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, 76346180 + ... + 76362698.

It is an arithmetic number, because the mean of its divisors is an integer number (46034896320).

Almost surely, 2^{1261298977841} is an apocalyptic number.

It is an amenable number.

1261298977841 is a deficient number, since it is larger than the sum of its proper divisors (211817704399).

1261298977841 is a wasteful number, since it uses less digits than its factorization.

1261298977841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17885.

The product of its digits is 24385536, while the sum is 65.

The spelling of 1261298977841 in words is "one trillion, two hundred sixty-one billion, two hundred ninety-eight million, nine hundred seventy-seven thousand, eight hundred forty-one".