1641534157 has 2 divisors, whose sum is σ = 1641534158. Its totient is φ = 1641534156.

The previous prime is 1641534149. The next prime is 1641534197. The reversal of 1641534157 is 7514351461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1598880196 + 42653961 = 39986^2 + 6531^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641534157 - 2³ = 1641534149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641534107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820767078 + 820767079.

It is an arithmetic number, because the mean of its divisors is an integer number (820767079).

Almost surely, 2^1641534157 is an apocalyptic number.

It is an amenable number.

1641534157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641534157 is an equidigital number, since it uses as much as digits as its factorization.

1641534157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 37.

The square root of 1641534157 is about 40515.8506883417. The cubic root of 1641534157 is about 1179.6413151413.

The spelling of 1641534157 in words is "one billion, six hundred forty-one million, five hundred thirty-four thousand, one hundred fifty-seven".