1212623661 has 16 divisors (see below), whose sum is σ = 1677965760. Its totient is φ = 778028160.

The previous prime is 1212623647. The next prime is 1212623701. The reversal of 1212623661 is 1663262121.

It is not a de Polignac number, because 1212623661 - 2⁶ = 1212623597 is a prime.

It is a super-2 number, since 2×1212623661² = 2940912286434085842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212623611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4966 + ... + 49496.

It is an arithmetic number, because the mean of its divisors is an integer number (104872860).

Almost surely, 2^1212623661 is an apocalyptic number.

It is an amenable number.

1212623661 is a deficient number, since it is larger than the sum of its proper divisors (465342099).

1212623661 is a wasteful number, since it uses less digits than its factorization.

1212623661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44876.

The product of its digits is 5184, while the sum is 30.

The square root of 1212623661 is about 34822.7463161652. The cubic root of 1212623661 is about 1066.3718678275.

Adding to 1212623661 its reverse (1663262121), we get a palindrome (2875885782).

The spelling of 1212623661 in words is "one billion, two hundred twelve million, six hundred twenty-three thousand, six hundred sixty-one".