152731906 has 4 divisors (see below), whose sum is σ = 229097862. Its totient is φ = 76365952.

The previous prime is 152731879. The next prime is 152731913. The reversal of 152731906 is 609137251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 609137251 = 17 ⋅35831603.

It can be written as a sum of positive squares in only one way, i.e., 151905625 + 826281 = 12325^2 + 909^2 .

It is a super-2 number, since 2×152731906² = 46654070220785672, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38182975 + ... + 38182978.

Almost surely, 2^152731906 is an apocalyptic number.

152731906 is a deficient number, since it is larger than the sum of its proper divisors (76365956).

152731906 is an equidigital number, since it uses as much as digits as its factorization.

152731906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76365955.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 152731906 is about 12358.4750677420. The cubic root of 152731906 is about 534.5355458974.

It can be divided in two parts, 1527 and 31906, that added together give a palindrome (33433).

The spelling of 152731906 in words is "one hundred fifty-two million, seven hundred thirty-one thousand, nine hundred six".