1212542345 has 32 divisors (see below), whose sum is σ = 1724371200. Its totient is φ = 800868096.

The previous prime is 1212542341. The next prime is 1212542347. The reversal of 1212542345 is 5432452121.

It is not a de Polignac number, because 1212542345 - 2² = 1212542341 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (1212542341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 515462 + ... + 517808.

It is an arithmetic number, because the mean of its divisors is an integer number (53886600).

Almost surely, 2^1212542345 is an apocalyptic number.

It is an amenable number.

1212542345 is a deficient number, since it is larger than the sum of its proper divisors (511828855).

1212542345 is a wasteful number, since it uses less digits than its factorization.

1212542345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2897.

The product of its digits is 9600, while the sum is 29.

The square root of 1212542345 is about 34821.5787264162. The cubic root of 1212542345 is about 1066.3480310742.

Adding to 1212542345 its reverse (5432452121), we get a palindrome (6644994466).

The spelling of 1212542345 in words is "one billion, two hundred twelve million, five hundred forty-two thousand, three hundred forty-five".