3774517981 has 4 divisors (see below), whose sum is σ = 4064865532. Its totient is φ = 3484170432.

The previous prime is 3774517961. The next prime is 3774517987. The reversal of 3774517981 is 1897154773.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 693268900 + 3081249081 = 26330^2 + 55509^2 .

It is a cyclic number.

It is not a de Polignac number, because 3774517981 - 2⁵ = 3774517949 is a prime.

It is a super-2 number, since 2×3774517981² = 28493971977784632722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3774517987) 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, 145173756 + ... + 145173781.

It is an arithmetic number, because the mean of its divisors is an integer number (1016216383).

Almost surely, 2^3774517981 is an apocalyptic number.

It is an amenable number.

3774517981 is a deficient number, since it is larger than the sum of its proper divisors (290347551).

3774517981 is a wasteful number, since it uses less digits than its factorization.

3774517981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290347550.

The product of its digits is 1481760, while the sum is 52.

The square root of 3774517981 is about 61437.1058970066. The cubic root of 3774517981 is about 1556.9948145968.

The spelling of 3774517981 in words is "three billion, seven hundred seventy-four million, five hundred seventeen thousand, nine hundred eighty-one".