3121951897 has 4 divisors (see below), whose sum is σ = 3257688960. Its totient is φ = 2986214836.

The previous prime is 3121951873. The next prime is 3121951907. The reversal of 3121951897 is 7981591213.

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: 7981591213 = 59 ⋅135281207.

It is a cyclic number.

It is not a de Polignac number, because 3121951897 - 2²³ = 3113563289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3121951817) 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, 67868497 + ... + 67868542.

It is an arithmetic number, because the mean of its divisors is an integer number (814422240).

Almost surely, 2^3121951897 is an apocalyptic number.

It is an amenable number.

3121951897 is a deficient number, since it is larger than the sum of its proper divisors (135737063).

3121951897 is a wasteful number, since it uses less digits than its factorization.

3121951897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135737062.

The product of its digits is 136080, while the sum is 46.

The square root of 3121951897 is about 55874.4297241592. The cubic root of 3121951897 is about 1461.5333700873.

The spelling of 3121951897 in words is "three billion, one hundred twenty-one million, nine hundred fifty-one thousand, eight hundred ninety-seven".