152031721 has 2 divisors, whose sum is σ = 152031722. Its totient is φ = 152031720.

The previous prime is 152031713. The next prime is 152031773. The reversal of 152031721 is 127130251.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112593321 + 39438400 = 10611^2 + 6280^2 .

It is an emirp because it is prime and its reverse (127130251) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 152031721 - 2³ = 152031713 is a prime.

It is a super-2 number, since 2×152031721² = 46227288380443682, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 152031692 and 152031701.

It is not a weakly prime, because it can be changed into another prime (152031791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76015860 + 76015861.

It is an arithmetic number, because the mean of its divisors is an integer number (76015861).

Almost surely, 2^152031721 is an apocalyptic number.

It is an amenable number.

152031721 is a deficient number, since it is larger than the sum of its proper divisors (1).

152031721 is an equidigital number, since it uses as much as digits as its factorization.

152031721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 152031721 is about 12330.1143952520. The cubic root of 152031721 is about 533.7174518853.

Adding to 152031721 its reverse (127130251), we get a palindrome (279161972).

The spelling of 152031721 in words is "one hundred fifty-two million, thirty-one thousand, seven hundred twenty-one".