3261429781 has 16 divisors (see below), whose sum is σ = 3510178560. Its totient is φ = 3020544000.

The previous prime is 3261429761. The next prime is 3261429793. The reversal of 3261429781 is 1879241623.

It is not a de Polignac number, because 3261429781 - 2⁵ = 3261429749 is a prime.

It is a super-2 number, since 2×3261429781² = 21273848432787415922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3261429761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1085281 + ... + 1088281.

It is an arithmetic number, because the mean of its divisors is an integer number (219386160).

Almost surely, 2^3261429781 is an apocalyptic number.

It is an amenable number.

3261429781 is a deficient number, since it is larger than the sum of its proper divisors (248748779).

3261429781 is a wasteful number, since it uses less digits than its factorization.

3261429781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4284.

The product of its digits is 145152, while the sum is 43.

The square root of 3261429781 is about 57108.9290829376. The cubic root of 3261429781 is about 1482.9824477561.

The spelling of 3261429781 in words is "three billion, two hundred sixty-one million, four hundred twenty-nine thousand, seven hundred eighty-one".