152239781 has 2 divisors, whose sum is σ = 152239782. Its totient is φ = 152239780.

The previous prime is 152239741. The next prime is 152239817. The reversal of 152239781 is 187932251.

Together with next prime (152239817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152127556 + 112225 = 12334^2 + 335^2 .

It is a cyclic number.

It is not a de Polignac number, because 152239781 - 2²² = 148045477 is a prime.

It is a super-2 number, since 2×152239781² = 46353901837855922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (152239741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76119890 + 76119891.

It is an arithmetic number, because the mean of its divisors is an integer number (76119891).

Almost surely, 2^152239781 is an apocalyptic number.

It is an amenable number.

152239781 is a deficient number, since it is larger than the sum of its proper divisors (1).

152239781 is an equidigital number, since it uses as much as digits as its factorization.

152239781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 38.

The square root of 152239781 is about 12338.5485775273. The cubic root of 152239781 is about 533.9608103864.

The spelling of 152239781 in words is "one hundred fifty-two million, two hundred thirty-nine thousand, seven hundred eighty-one".