1377047981 has 8 divisors (see below), whose sum is σ = 1414794264. Its totient is φ = 1339329600.

The previous prime is 1377047963. The next prime is 1377047999. The reversal of 1377047981 is 1897407731.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1377047963) and next prime (1377047999).

It can be written as a sum of positive squares in 4 ways, for example, as 355925956 + 1021122025 = 18866^2 + 31955^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1377047981 is a prime.

It is a super-2 number, since 2×1377047981² = 3792522283952352722, 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 (1377047951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128531 + ... + 138831.

It is an arithmetic number, because the mean of its divisors is an integer number (176849283).

Almost surely, 2^1377047981 is an apocalyptic number.

It is an amenable number.

1377047981 is a deficient number, since it is larger than the sum of its proper divisors (37746283).

1377047981 is a wasteful number, since it uses less digits than its factorization.

1377047981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13951.

The product of its (nonzero) digits is 296352, while the sum is 47.

The square root of 1377047981 is about 37108.5971305842. The cubic root of 1377047981 is about 1112.5418525011.

The spelling of 1377047981 in words is "one billion, three hundred seventy-seven million, forty-seven thousand, nine hundred eighty-one".