12621501 has 10 divisors (see below), whose sum is σ = 18854462. Its totient is φ = 8414280.

The previous prime is 12621493. The next prime is 12621509. The reversal of 12621501 is 10512621.

12621501 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12621493) and next prime (12621509).

It can be written as a sum of positive squares in only one way, i.e., 12320100 + 301401 = 3510^2 + 549^2 .

It is not a de Polignac number, because 12621501 - 2³ = 12621493 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 (12621509) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 77830 + ... + 77991.

Almost surely, 2^12621501 is an apocalyptic number.

It is an amenable number.

12621501 is a deficient number, since it is larger than the sum of its proper divisors (6232961).

12621501 is an equidigital number, since it uses as much as digits as its factorization.

12621501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155833 (or 155824 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 12621501 is about 3552.6751892060. The cubic root of 12621501 is about 232.8289620148.

The spelling of 12621501 in words is "twelve million, six hundred twenty-one thousand, five hundred one".