1934315781 has 4 divisors (see below), whose sum is σ = 2579087712. Its totient is φ = 1289543852.

The previous prime is 1934315749. The next prime is 1934315783. The reversal of 1934315781 is 1875134391.

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 1934315781 - 2⁵ = 1934315749 is a prime.

It is a super-2 number, since 2×1934315781² = 7483155081251279922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1934315783) 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, 322385961 + ... + 322385966.

It is an arithmetic number, because the mean of its divisors is an integer number (644771928).

Almost surely, 2^1934315781 is an apocalyptic number.

It is an amenable number.

1934315781 is a deficient number, since it is larger than the sum of its proper divisors (644771931).

1934315781 is an equidigital number, since it uses as much as digits as its factorization.

1934315781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644771930.

The product of its digits is 90720, while the sum is 42.

The square root of 1934315781 is about 43980.8569834650. The cubic root of 1934315781 is about 1245.9744162708.

The spelling of 1934315781 in words is "one billion, nine hundred thirty-four million, three hundred fifteen thousand, seven hundred eighty-one".