1215041531 has 8 divisors (see below), whose sum is σ = 1344169728. Its totient is φ = 1089025000.

The previous prime is 1215041521. The next prime is 1215041537. The reversal of 1215041531 is 1351405121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1215041531 is a prime.

It is a super-2 number, since 2×1215041531² = 2952651844109647922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1215041497 and 1215041506.

It is not an unprimeable number, because it can be changed into a prime (1215041537) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 777095 + ... + 778656.

It is an arithmetic number, because the mean of its divisors is an integer number (168021216).

Almost surely, 2^1215041531 is an apocalyptic number.

1215041531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1215041531 is a deficient number, since it is larger than the sum of its proper divisors (129128197).

1215041531 is a wasteful number, since it uses less digits than its factorization.

1215041531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555833.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 1215041531 is about 34857.4458473365. The cubic root of 1215041531 is about 1067.0801493431.

Adding to 1215041531 its reverse (1351405121), we get a palindrome (2566446652).

The spelling of 1215041531 in words is "one billion, two hundred fifteen million, forty-one thousand, five hundred thirty-one".