1427051381 has 4 divisors (see below), whose sum is σ = 1630915872. Its totient is φ = 1223186892.

The previous prime is 1427051347. The next prime is 1427051387. The reversal of 1427051381 is 1831507241.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1831507241 = 419 ⋅4371139.

It is a cyclic number.

It is not a de Polignac number, because 1427051381 - 2¹⁸ = 1426789237 is a prime.

It is a super-2 number, since 2×1427051381² = 4072951288028014322, 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 (1427051387) 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, 101932235 + ... + 101932248.

It is an arithmetic number, because the mean of its divisors is an integer number (407728968).

Almost surely, 2^1427051381 is an apocalyptic number.

It is an amenable number.

1427051381 is a deficient number, since it is larger than the sum of its proper divisors (203864491).

1427051381 is an equidigital number, since it uses as much as digits as its factorization.

1427051381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203864490.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 1427051381 is about 37776.3336098145. Note that the first 3 decimals coincide. The cubic root of 1427051381 is about 1125.8482835990.

The spelling of 1427051381 in words is "one billion, four hundred twenty-seven million, fifty-one thousand, three hundred eighty-one".