12691501 has 2 divisors, whose sum is σ = 12691502. Its totient is φ = 12691500.

The previous prime is 12691451. The next prime is 12691519. The reversal of 12691501 is 10519621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12595401 + 96100 = 3549^2 + 310^2 .

It is a cyclic number.

It is not a de Polignac number, because 12691501 - 2¹⁵ = 12658733 is a prime.

It is a super-2 number, since 2×12691501² = 322148395266002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12691541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6345750 + 6345751.

It is an arithmetic number, because the mean of its divisors is an integer number (6345751).

Almost surely, 2^12691501 is an apocalyptic number.

It is an amenable number.

12691501 is a deficient number, since it is larger than the sum of its proper divisors (1).

12691501 is an equidigital number, since it uses as much as digits as its factorization.

12691501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 12691501 is about 3562.5132982208. The cubic root of 12691501 is about 233.2585989684.

The spelling of 12691501 in words is "twelve million, six hundred ninety-one thousand, five hundred one".