1353787381 has 4 divisors (see below), whose sum is σ = 1354288000. Its totient is φ = 1353286764.

The previous prime is 1353787319. The next prime is 1353787399. The reversal of 1353787381 is 1837873531.

It is a happy number.

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: 1837873531 = 13 ⋅141374887.

It is a cyclic number.

It is not a de Polignac number, because 1353787381 - 2¹⁷ = 1353656309 is a prime.

It is a super-2 number, since 2×1353787381² = 3665480545909678322, 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 (1353787681) 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, 246231 + ... + 251668.

It is an arithmetic number, because the mean of its divisors is an integer number (338572000).

Almost surely, 2^1353787381 is an apocalyptic number.

It is an amenable number.

1353787381 is a deficient number, since it is larger than the sum of its proper divisors (500619).

1353787381 is an equidigital number, since it uses as much as digits as its factorization.

1353787381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500618.

The product of its digits is 423360, while the sum is 46.

The square root of 1353787381 is about 36793.8497713952. The cubic root of 1353787381 is about 1106.2420276017.

The spelling of 1353787381 in words is "one billion, three hundred fifty-three million, seven hundred eighty-seven thousand, three hundred eighty-one".