2151521530637 has 2 divisors, whose sum is σ = 2151521530638. Its totient is φ = 2151521530636.

The previous prime is 2151521530583. The next prime is 2151521530679. The reversal of 2151521530637 is 7360351251512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2000671631401 + 150849899236 = 1414451^2 + 388394^2 .

It is a cyclic number.

It is not a de Polignac number, because 2151521530637 - 2⁸ = 2151521530381 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2151521530594 and 2151521530603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2151521530237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075760765318 + 1075760765319.

It is an arithmetic number, because the mean of its divisors is an integer number (1075760765319).

Almost surely, 2^{2151521530637} is an apocalyptic number.

It is an amenable number.

2151521530637 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151521530637 is an equidigital number, since it uses as much as digits as its factorization.

2151521530637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 189000, while the sum is 41.

The spelling of 2151521530637 in words is "two trillion, one hundred fifty-one billion, five hundred twenty-one million, five hundred thirty thousand, six hundred thirty-seven".