1212653653 has 4 divisors (see below), whose sum is σ = 1221377920. Its totient is φ = 1203929388.

The previous prime is 1212653623. The next prime is 1212653657. The reversal of 1212653653 is 3563562121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3563562121 = 7 ⋅509080303.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212653653 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 (1212653657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4361925 + ... + 4362202.

It is an arithmetic number, because the mean of its divisors is an integer number (305344480).

Almost surely, 2^1212653653 is an apocalyptic number.

It is an amenable number.

1212653653 is a deficient number, since it is larger than the sum of its proper divisors (8724267).

1212653653 is an equidigital number, since it uses as much as digits as its factorization.

1212653653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8724266.

The product of its digits is 32400, while the sum is 34.

The square root of 1212653653 is about 34823.1769515649. The cubic root of 1212653653 is about 1066.3806593326.

The spelling of 1212653653 in words is "one billion, two hundred twelve million, six hundred fifty-three thousand, six hundred fifty-three".