1201511506 has 8 divisors (see below), whose sum is σ = 1940903244. Its totient is φ = 554543760.

The previous prime is 1201511501. The next prime is 1201511539. The reversal of 1201511506 is 6051151021.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1201246281 + 265225 = 34659^2 + 515^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1201511501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23105965 + ... + 23106016.

Almost surely, 2^1201511506 is an apocalyptic number.

1201511506 is a deficient number, since it is larger than the sum of its proper divisors (739391738).

1201511506 is a wasteful number, since it uses less digits than its factorization.

1201511506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46211996.

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 1201511506 is about 34662.8259955821. The cubic root of 1201511506 is about 1063.1045527618.

Adding to 1201511506 its reverse (6051151021), we get a palindrome (7252662527).

The spelling of 1201511506 in words is "one billion, two hundred one million, five hundred eleven thousand, five hundred six".