151221530 has 16 divisors (see below), whose sum is σ = 278838504. Its totient is φ = 59013120.

The previous prime is 151221529. The next prime is 151221533. The reversal of 151221530 is 35122151.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 70778569 + 80442961 = 8413^2 + 8969^2 .

It is a super-2 number, since 2×151221530² = 45735902271081800, which contains 22 as substring.

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 184007 + ... + 184826.

Almost surely, 2^151221530 is an apocalyptic number.

151221530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

151221530 is a deficient number, since it is larger than the sum of its proper divisors (127616974).

151221530 is a wasteful number, since it uses less digits than its factorization.

151221530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368881.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 151221530 is about 12297.2163516789. The cubic root of 151221530 is about 532.7676863179.

Adding to 151221530 its reverse (35122151), we get a palindrome (186343681).

The spelling of 151221530 in words is "one hundred fifty-one million, two hundred twenty-one thousand, five hundred thirty".