1374847781 has 4 divisors (see below), whose sum is σ = 1382795052. Its totient is φ = 1366900512.

The previous prime is 1374847759. The next prime is 1374847819. The reversal of 1374847781 is 1877484731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1877484731 = 1033 ⋅1817507.

It can be written as a sum of positive squares in 2 ways, for example, as 1286656900 + 88190881 = 35870^2 + 9391^2 .

It is a cyclic number.

It is not a de Polignac number, because 1374847781 - 2⁶ = 1374847717 is a prime.

It is a super-2 number, since 2×1374847781² = 3780412841841247922, 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 (1374847741) 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, 3973376 + ... + 3973721.

It is an arithmetic number, because the mean of its divisors is an integer number (345698763).

Almost surely, 2^1374847781 is an apocalyptic number.

It is an amenable number.

1374847781 is a deficient number, since it is larger than the sum of its proper divisors (7947271).

1374847781 is an equidigital number, since it uses as much as digits as its factorization.

1374847781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7947270.

The product of its digits is 1053696, while the sum is 50.

The square root of 1374847781 is about 37078.9398580920. The cubic root of 1374847781 is about 1111.9490095854.

The spelling of 1374847781 in words is "one billion, three hundred seventy-four million, eight hundred forty-seven thousand, seven hundred eighty-one".