151215561 has 48 divisors (see below), whose sum is σ = 265794048. Its totient is φ = 80870400.

The previous prime is 151215557. The next prime is 151215569. The reversal of 151215561 is 165512151.

It is not a de Polignac number, because 151215561 - 2² = 151215557 is a prime.

It is a super-2 number, since 2×151215561² = 45732291777089442, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (151215569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 289981 + ... + 290501.

It is an arithmetic number, because the mean of its divisors is an integer number (5537376).

Almost surely, 2^151215561 is an apocalyptic number.

It is an amenable number.

151215561 is a deficient number, since it is larger than the sum of its proper divisors (114578487).

151215561 is a wasteful number, since it uses less digits than its factorization.

151215561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822 (or 819 counting only the distinct ones).

The product of its digits is 1500, while the sum is 27.

The square root of 151215561 is about 12296.9736520820. The cubic root of 151215561 is about 532.7606764427.

The spelling of 151215561 in words is "one hundred fifty-one million, two hundred fifteen thousand, five hundred sixty-one".