81500037 has 8 divisors (see below), whose sum is σ = 109146336. Its totient is φ = 54093552.

The previous prime is 81499997. The next prime is 81500077. The reversal of 81500037 is 73000518.

It is an interprime number because it is at equal distance from previous prime (81499997) and next prime (81500077).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81500037 - 2⁶ = 81499973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81500077) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59158 + ... + 60519.

It is an arithmetic number, because the mean of its divisors is an integer number (13643292).

Almost surely, 2^81500037 is an apocalyptic number.

It is an amenable number.

81500037 is a deficient number, since it is larger than the sum of its proper divisors (27646299).

81500037 is a wasteful number, since it uses less digits than its factorization.

81500037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119907.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 81500037 is about 9027.7370918741. The cubic root of 81500037 is about 433.5633886251.

The spelling of 81500037 in words is "eighty-one million, five hundred thousand, thirty-seven".