1212653657 has 2 divisors, whose sum is σ = 1212653658. Its totient is φ = 1212653656.

The previous prime is 1212653623. The next prime is 1212653671. The reversal of 1212653657 is 7563562121.

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., 989479936 + 223173721 = 31456^2 + 14939^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212653657 - 2¹⁰ = 1212652633 is a prime.

It is a super-3 number, since 3×1212653657³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1212653657.

It is not a weakly prime, because it can be changed into another prime (1212653677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606326828 + 606326829.

It is an arithmetic number, because the mean of its divisors is an integer number (606326829).

Almost surely, 2^1212653657 is an apocalyptic number.

It is an amenable number.

1212653657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212653657 is an equidigital number, since it uses as much as digits as its factorization.

1212653657 is an evil number, because the sum of its binary digits is even.

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

The square root of 1212653657 is about 34823.1770089979. The cubic root of 1212653657 is about 1066.3806605051.

The spelling of 1212653657 in words is "one billion, two hundred twelve million, six hundred fifty-three thousand, six hundred fifty-seven".