73212531 has 16 divisors (see below), whose sum is σ = 114157824. Its totient is φ = 40862304.

The previous prime is 73212527. The next prime is 73212533. The reversal of 73212531 is 13521237.

It is not a de Polignac number, because 73212531 - 2² = 73212527 is a prime.

It is a super-2 number, since 2×73212531² = 10720149390851922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (73212533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39636 + ... + 41441.

It is an arithmetic number, because the mean of its divisors is an integer number (7134864).

Almost surely, 2^73212531 is an apocalyptic number.

73212531 is a deficient number, since it is larger than the sum of its proper divisors (40945293).

73212531 is a wasteful number, since it uses less digits than its factorization.

73212531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81130.

The product of its digits is 1260, while the sum is 24.

The square root of 73212531 is about 8556.4321419620. The cubic root of 73212531 is about 418.3391153133.

Adding to 73212531 its reverse (13521237), we get a palindrome (86733768).

The spelling of 73212531 in words is "seventy-three million, two hundred twelve thousand, five hundred thirty-one".