1375887731 has 2 divisors, whose sum is σ = 1375887732. Its totient is φ = 1375887730.

The previous prime is 1375887713. The next prime is 1375887739. The reversal of 1375887731 is 1377885731.

It is a happy number.

Together with previous prime (1375887713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1375887731 is a prime.

It is a super-2 number, since 2×1375887731² = 3786134096632656722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1375887731.

It is not a weakly prime, because it can be changed into another prime (1375887739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 687943865 + 687943866.

It is an arithmetic number, because the mean of its divisors is an integer number (687943866).

Almost surely, 2^1375887731 is an apocalyptic number.

1375887731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1375887731 is an equidigital number, since it uses as much as digits as its factorization.

1375887731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 987840, while the sum is 50.

The square root of 1375887731 is about 37092.9606664122. The cubic root of 1375887731 is about 1112.2293024166.

The spelling of 1375887731 in words is "one billion, three hundred seventy-five million, eight hundred eighty-seven thousand, seven hundred thirty-one".