1377505231 has 4 divisors (see below), whose sum is σ = 1377588600. Its totient is φ = 1377421864.

The previous prime is 1377505183. The next prime is 1377505247. The reversal of 1377505231 is 1325057731.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1325057731 = 2837 ⋅467063.

It is a cyclic number.

It is not a de Polignac number, because 1377505231 - 2²¹ = 1375408079 is a prime.

It is a super-2 number, since 2×1377505231² = 3795041322864726722, 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 (1377505531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7621 + ... + 53038.

It is an arithmetic number, because the mean of its divisors is an integer number (344397150).

Almost surely, 2^1377505231 is an apocalyptic number.

1377505231 is a deficient number, since it is larger than the sum of its proper divisors (83369).

1377505231 is an equidigital number, since it uses as much as digits as its factorization.

1377505231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83368.

The product of its (nonzero) digits is 22050, while the sum is 34.

The square root of 1377505231 is about 37114.7575904788. The cubic root of 1377505231 is about 1112.6649790428.

The spelling of 1377505231 in words is "one billion, three hundred seventy-seven million, five hundred five thousand, two hundred thirty-one".