151221563 has 4 divisors (see below), whose sum is σ = 153135840. Its totient is φ = 149307288.

The previous prime is 151221557. The next prime is 151221593. The reversal of 151221563 is 365122151.

151221563 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 365122151 = 29 ⋅12590419.

It is a cyclic number.

It is not a de Polignac number, because 151221563 - 2⁴ = 151221547 is a prime.

It is a super-2 number, since 2×151221563² = 45735922232325938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (151221533) 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, 957020 + ... + 957177.

It is an arithmetic number, because the mean of its divisors is an integer number (38283960).

Almost surely, 2^151221563 is an apocalyptic number.

151221563 is a deficient number, since it is larger than the sum of its proper divisors (1914277).

151221563 is an equidigital number, since it uses as much as digits as its factorization.

151221563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1914276.

The product of its digits is 1800, while the sum is 26.

The square root of 151221563 is about 12297.2176934459. The cubic root of 151221563 is about 532.7677250719.

The spelling of 151221563 in words is "one hundred fifty-one million, two hundred twenty-one thousand, five hundred sixty-three".