3157993 has 2 divisors, whose sum is σ = 3157994. Its totient is φ = 3157992.

The previous prime is 3157991. The next prime is 3158033. The reversal of 3157993 is 3997513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2782224 + 375769 = 1668^2 + 613^2 .

It is a cyclic number.

It is not a de Polignac number, because 3157993 - 2¹ = 3157991 is a prime.

Together with 3157991, it forms a pair of twin primes.

3157993 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (3157991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1578996 + 1578997.

It is an arithmetic number, because the mean of its divisors is an integer number (1578997).

Almost surely, 2^3157993 is an apocalyptic number.

It is an amenable number.

3157993 is a deficient number, since it is larger than the sum of its proper divisors (1).

3157993 is an equidigital number, since it uses as much as digits as its factorization.

3157993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25515, while the sum is 37.

The square root of 3157993 is about 1777.0742809461. The cubic root of 3157993 is about 146.7136046967.

The spelling of 3157993 in words is "three million, one hundred fifty-seven thousand, nine hundred ninety-three".