1215320552 has 32 divisors (see below), whose sum is σ = 2400062400. Its totient is φ = 575798784.

The previous prime is 1215320539. The next prime is 1215320563. The reversal of 1215320552 is 2550235121.

It is a super-2 number, since 2×1215320552² = 2954008088227169408, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11177 + ... + 50552.

It is an arithmetic number, because the mean of its divisors is an integer number (75001950).

Almost surely, 2^1215320552 is an apocalyptic number.

It is an amenable number.

1215320552 is a deficient number, since it is larger than the sum of its proper divisors (1184741848).

1215320552 is a wasteful number, since it uses less digits than its factorization.

1215320552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61865 (or 61861 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 1215320552 is about 34861.4479332113. The cubic root of 1215320552 is about 1067.1618241871.

Adding to 1215320552 its reverse (2550235121), we get a palindrome (3765555673).

The spelling of 1215320552 in words is "one billion, two hundred fifteen million, three hundred twenty thousand, five hundred fifty-two".