1375556477 has 2 divisors, whose sum is σ = 1375556478. Its totient is φ = 1375556476.

The previous prime is 1375556417. The next prime is 1375556491. The reversal of 1375556477 is 7746555731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 955675396 + 419881081 = 30914^2 + 20491^2 .

It is an emirp because it is prime and its reverse (7746555731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1375556477 - 2²² = 1371362173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1375556417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 687778238 + 687778239.

It is an arithmetic number, because the mean of its divisors is an integer number (687778239).

Almost surely, 2^1375556477 is an apocalyptic number.

It is an amenable number.

1375556477 is a deficient number, since it is larger than the sum of its proper divisors (1).

1375556477 is an equidigital number, since it uses as much as digits as its factorization.

1375556477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3087000, while the sum is 50.

The square root of 1375556477 is about 37088.4952107793. The cubic root of 1375556477 is about 1112.1400364181.

The spelling of 1375556477 in words is "one billion, three hundred seventy-five million, five hundred fifty-six thousand, four hundred seventy-seven".