3391972561 has 4 divisors (see below), whose sum is σ = 3393442624. Its totient is φ = 3390502500.

The previous prime is 3391972553. The next prime is 3391972579. The reversal of 3391972561 is 1652791933.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1652791933 = 13 ⋅127137841.

It is a cyclic number.

It is not a de Polignac number, because 3391972561 - 2³ = 3391972553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3391973561) 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, 731565 + ... + 736186.

It is an arithmetic number, because the mean of its divisors is an integer number (848360656).

Almost surely, 2^3391972561 is an apocalyptic number.

It is an amenable number.

3391972561 is a deficient number, since it is larger than the sum of its proper divisors (1470063).

3391972561 is a wasteful number, since it uses less digits than its factorization.

3391972561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1470062.

The product of its digits is 306180, while the sum is 46.

The square root of 3391972561 is about 58240.6435489856. The cubic root of 3391972561 is about 1502.5102502339.

The spelling of 3391972561 in words is "three billion, three hundred ninety-one million, nine hundred seventy-two thousand, five hundred sixty-one".