1215231542 has 32 divisors (see below), whose sum is σ = 2177639424. Its totient is φ = 497296800.

The previous prime is 1215231491. The next prime is 1215231551. The reversal of 1215231542 is 2451325121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200192 + ... + 206172.

It is an arithmetic number, because the mean of its divisors is an integer number (68051232).

Almost surely, 2^1215231542 is an apocalyptic number.

1215231542 is a deficient number, since it is larger than the sum of its proper divisors (962407882).

1215231542 is a wasteful number, since it uses less digits than its factorization.

1215231542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6644.

The product of its digits is 2400, while the sum is 26.

The square root of 1215231542 is about 34860.1712847198. The cubic root of 1215231542 is about 1067.1357705963.

Adding to 1215231542 its reverse (2451325121), we get a palindrome (3666556663).

The spelling of 1215231542 in words is "one billion, two hundred fifteen million, two hundred thirty-one thousand, five hundred forty-two".