1274111981 has 4 divisors (see below), whose sum is σ = 1275035964. Its totient is φ = 1273188000.

The previous prime is 1274111977. The next prime is 1274112029. The reversal of 1274111981 is 1891114721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1891114721 = 16477 ⋅114773.

It can be written as a sum of positive squares in 2 ways, for example, as 380640100 + 893471881 = 19510^2 + 29891^2 .

It is a cyclic number.

It is not a de Polignac number, because 1274111981 - 2² = 1274111977 is a prime.

It is a super-2 number, since 2×1274111981² = 3246722680255488722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1274111911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 459920 + ... + 462681.

It is an arithmetic number, because the mean of its divisors is an integer number (318758991).

Almost surely, 2^1274111981 is an apocalyptic number.

It is an amenable number.

1274111981 is a deficient number, since it is larger than the sum of its proper divisors (923983).

1274111981 is an equidigital number, since it uses as much as digits as its factorization.

1274111981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923982.

The product of its digits is 4032, while the sum is 35.

The square root of 1274111981 is about 35694.7052236042. The cubic root of 1274111981 is about 1084.0996391415.

The spelling of 1274111981 in words is "one billion, two hundred seventy-four million, one hundred eleven thousand, nine hundred eighty-one".