2161531405037 has 2 divisors, whose sum is σ = 2161531405038. Its totient is φ = 2161531405036.

The previous prime is 2161531405003. The next prime is 2161531405049. The reversal of 2161531405037 is 7305041351612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1110032923561 + 1051498481476 = 1053581^2 + 1025426^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161531405037 - 2⁶ = 2161531404973 is a prime.

It is a super-2 number, since 2×2161531405037² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2161531405937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080765702518 + 1080765702519.

It is an arithmetic number, because the mean of its divisors is an integer number (1080765702519).

Almost surely, 2^{2161531405037} is an apocalyptic number.

It is an amenable number.

2161531405037 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161531405037 is an equidigital number, since it uses as much as digits as its factorization.

2161531405037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 38.

Adding to 2161531405037 its reverse (7305041351612), we get a palindrome (9466572756649).

The spelling of 2161531405037 in words is "two trillion, one hundred sixty-one billion, five hundred thirty-one million, four hundred five thousand, thirty-seven".