1375615381 has 4 divisors (see below), whose sum is σ = 1572131872. Its totient is φ = 1179098892.

The previous prime is 1375615361. The next prime is 1375615393. The reversal of 1375615381 is 1835165731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1375615381 - 2⁹ = 1375614869 is a prime.

It is a super-2 number, since 2×1375615381² = 3784635352887550322, 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 (1375615361) 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, 98258235 + ... + 98258248.

It is an arithmetic number, because the mean of its divisors is an integer number (393032968).

Almost surely, 2^1375615381 is an apocalyptic number.

It is an amenable number.

1375615381 is a deficient number, since it is larger than the sum of its proper divisors (196516491).

1375615381 is an equidigital number, since it uses as much as digits as its factorization.

1375615381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196516490.

The product of its digits is 75600, while the sum is 40.

The square root of 1375615381 is about 37089.2893029780. The cubic root of 1375615381 is about 1112.1559108569.

The spelling of 1375615381 in words is "one billion, three hundred seventy-five million, six hundred fifteen thousand, three hundred eighty-one".