1375221851 has 4 divisors (see below), whose sum is σ = 1456117272. Its totient is φ = 1294326432.

The previous prime is 1375221823. The next prime is 1375221871. The reversal of 1375221851 is 1581225731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1581225731 = 8969 ⋅176299.

It is a cyclic number.

It is not a de Polignac number, because 1375221851 - 2¹⁴ = 1375205467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1375221871) 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, 40447685 + ... + 40447718.

It is an arithmetic number, because the mean of its divisors is an integer number (364029318).

Almost surely, 2^1375221851 is an apocalyptic number.

1375221851 is a deficient number, since it is larger than the sum of its proper divisors (80895421).

1375221851 is an equidigital number, since it uses as much as digits as its factorization.

1375221851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80895420.

The product of its digits is 16800, while the sum is 35.

The square root of 1375221851 is about 37083.9837530975. The cubic root of 1375221851 is about 1112.0498471845.

The spelling of 1375221851 in words is "one billion, three hundred seventy-five million, two hundred twenty-one thousand, eight hundred fifty-one".