3161421157 has 4 divisors (see below), whose sum is σ = 3167097516. Its totient is φ = 3155744800.

The previous prime is 3161421149. The next prime is 3161421173. The reversal of 3161421157 is 7511241613.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 285136996 + 2876284161 = 16886^2 + 53631^2 .

It is a cyclic number.

It is not a de Polignac number, because 3161421157 - 2³ = 3161421149 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 (3161424157) 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, 2837344 + ... + 2838457.

It is an arithmetic number, because the mean of its divisors is an integer number (791774379).

Almost surely, 2^3161421157 is an apocalyptic number.

It is an amenable number.

3161421157 is a deficient number, since it is larger than the sum of its proper divisors (5676359).

3161421157 is an equidigital number, since it uses as much as digits as its factorization.

3161421157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5676358.

The product of its digits is 5040, while the sum is 31.

The square root of 3161421157 is about 56226.5164935549. The cubic root of 3161421157 is about 1467.6667378047. Note that the first 3 decimals are identical.

The spelling of 3161421157 in words is "three billion, one hundred sixty-one million, four hundred twenty-one thousand, one hundred fifty-seven".