3551220427 has 4 divisors (see below), whose sum is σ = 3618224640. Its totient is φ = 3484216216.

The previous prime is 3551220397. The next prime is 3551220451. The reversal of 3551220427 is 7240221553.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7240221553 = 281 ⋅25765913.

It is a cyclic number.

It is not a de Polignac number, because 3551220427 - 2¹¹ = 3551218379 is a prime.

It is a super-2 number, since 2×3551220427² = 25222333042284124658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3551224427) 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, 33502027 + ... + 33502132.

It is an arithmetic number, because the mean of its divisors is an integer number (904556160).

Almost surely, 2^3551220427 is an apocalyptic number.

3551220427 is a deficient number, since it is larger than the sum of its proper divisors (67004213).

3551220427 is an equidigital number, since it uses as much as digits as its factorization.

3551220427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67004212.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 3551220427 is about 59592.1171548721. The cubic root of 3551220427 is about 1525.6650940363.

The spelling of 3551220427 in words is "three billion, five hundred fifty-one million, two hundred twenty thousand, four hundred twenty-seven".