1275185236081 has 9 divisors (see below), whose sum is σ = 1279651118169. Its totient is φ = 1270734897300.

The previous prime is 1275185236067. The next prime is 1275185236109. The reversal of 1275185236081 is 1806325815721.

The square root of 1275185236081 is 1129241.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1275185236081 - 2⁷ = 1275185235953 is a prime.

It is a super-2 number, since 2×1275185236081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1275185231081) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 351192136 + ... + 351195766.

Almost surely, 2^{1275185236081} is an apocalyptic number.

1275185236081 is the 1129241-st square number.

1275185236081 is the 564621-st centered octagonal number.

It is an amenable number.

1275185236081 is a deficient number, since it is larger than the sum of its proper divisors (4465882088).

1275185236081 is an frugal number, since it uses more digits than its factorization.

1275185236081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7884 (or 3942 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 49.

Multiplying 1275185236081 by its sum of digits (49), we get a square (62484076567969 = 7904687²).

The spelling of 1275185236081 in words is "one trillion, two hundred seventy-five billion, one hundred eighty-five million, two hundred thirty-six thousand, eighty-one".