1213402154 has 4 divisors (see below), whose sum is σ = 1820103234. Its totient is φ = 606701076.

The previous prime is 1213402147. The next prime is 1213402163. The reversal of 1213402154 is 4512043121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4512043121 = 6421 ⋅702701.

It can be written as a sum of positive squares in only one way, i.e., 1200276025 + 13126129 = 34645^2 + 3623^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 303350537 + ... + 303350540.

Almost surely, 2^1213402154 is an apocalyptic number.

1213402154 is a deficient number, since it is larger than the sum of its proper divisors (606701080).

1213402154 is an equidigital number, since it uses as much as digits as its factorization.

1213402154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606701079.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1213402154 is about 34833.9224607278. The cubic root of 1213402154 is about 1066.6000192516.

Adding to 1213402154 its reverse (4512043121), we get a palindrome (5725445275).

The spelling of 1213402154 in words is "one billion, two hundred thirteen million, four hundred two thousand, one hundred fifty-four".