151221542 has 4 divisors (see below), whose sum is σ = 226832316. Its totient is φ = 75610770.

The previous prime is 151221541. The next prime is 151221547. The reversal of 151221542 is 245122151.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 245122151 = 37 ⋅6624923.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151221541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37805384 + ... + 37805387.

It is an arithmetic number, because the mean of its divisors is an integer number (56708079).

Almost surely, 2^151221542 is an apocalyptic number.

151221542 is a deficient number, since it is larger than the sum of its proper divisors (75610774).

151221542 is an equidigital number, since it uses as much as digits as its factorization.

151221542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75610773.

The product of its digits is 800, while the sum is 23.

The square root of 151221542 is about 12297.2168395942. The cubic root of 151221542 is about 532.7677004102.

Adding to 151221542 its reverse (245122151), we get a palindrome (396343693).

The spelling of 151221542 in words is "one hundred fifty-one million, two hundred twenty-one thousand, five hundred forty-two".