1221262523 has 8 divisors (see below), whose sum is σ = 1343189568. Its totient is φ = 1103333184.

The previous prime is 1221262513. The next prime is 1221262543. The reversal of 1221262523 is 3252621221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221262523 - 2⁶ = 1221262459 is a prime.

It is a super-5 number, since 5×1221262523⁵ (a number of 47 digits) contains 55555 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221262492 and 1221262501.

It is not an unprimeable number, because it can be changed into a prime (1221262513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 998786 + ... + 1000007.

It is an arithmetic number, because the mean of its divisors is an integer number (167898696).

Almost surely, 2^1221262523 is an apocalyptic number.

1221262523 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1221262523 is a deficient number, since it is larger than the sum of its proper divisors (121927045).

1221262523 is a wasteful number, since it uses less digits than its factorization.

1221262523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1998853.

The product of its digits is 2880, while the sum is 26.

The square root of 1221262523 is about 34946.5666840106. The cubic root of 1221262523 is about 1068.8981941579.

Adding to 1221262523 its reverse (3252621221), we get a palindrome (4473883744).

The spelling of 1221262523 in words is "one billion, two hundred twenty-one million, two hundred sixty-two thousand, five hundred twenty-three".