3291906397 has 6 divisors (see below), whose sum is σ = 3545352762. Its totient is φ = 3038491872.

The previous prime is 3291906383. The next prime is 3291906437. The reversal of 3291906397 is 7936091923.

It can be written as a sum of positive squares in 3 ways, for example, as 856089081 + 2435817316 = 29259^2 + 49354^2 .

It is a de Polignac number, because none of the positive numbers 2^k-3291906397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3291906397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3291906347) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 198913 + ... + 214825.

It is an arithmetic number, because the mean of its divisors is an integer number (590892127).

Almost surely, 2^3291906397 is an apocalyptic number.

It is an amenable number.

3291906397 is a deficient number, since it is larger than the sum of its proper divisors (253446365).

3291906397 is an frugal number, since it uses more digits than its factorization.

3291906397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31839 (or 15926 counting only the distinct ones).

The product of its (nonzero) digits is 551124, while the sum is 49.

The square root of 3291906397 is about 57375.1374464585. The cubic root of 3291906397 is about 1487.5874049057.

The spelling of 3291906397 in words is "three billion, two hundred ninety-one million, nine hundred six thousand, three hundred ninety-seven".