3251661421 has 4 divisors (see below), whose sum is σ = 3252981952. Its totient is φ = 3250340892.

The previous prime is 3251661379. The next prime is 3251661461. The reversal of 3251661421 is 1241661523.

It is a happy number.

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: 1241661523 = 1831 ⋅678133.

It is a cyclic number.

It is not a de Polignac number, because 3251661421 - 2²⁵ = 3218106989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3251661461) 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, 656565 + ... + 661498.

It is an arithmetic number, because the mean of its divisors is an integer number (813245488).

Almost surely, 2^3251661421 is an apocalyptic number.

It is an amenable number.

3251661421 is a deficient number, since it is larger than the sum of its proper divisors (1320531).

3251661421 is a wasteful number, since it uses less digits than its factorization.

3251661421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320530.

The product of its digits is 8640, while the sum is 31.

The square root of 3251661421 is about 57023.3410192703. The cubic root of 3251661421 is about 1481.5003990605.

The spelling of 3251661421 in words is "three billion, two hundred fifty-one million, six hundred sixty-one thousand, four hundred twenty-one".