81151946 has 16 divisors (see below), whose sum is σ = 123367104. Its totient is φ = 40032384.

The previous prime is 81151943. The next prime is 81151951. The reversal of 81151946 is 64915118.

It is not an unprimeable number, because it can be changed into a prime (81151943) 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, 108851 + ... + 109593.

It is an arithmetic number, because the mean of its divisors is an integer number (7710444).

Almost surely, 2^81151946 is an apocalyptic number.

81151946 is a deficient number, since it is larger than the sum of its proper divisors (42215158).

81151946 is a wasteful number, since it uses less digits than its factorization.

81151946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1405.

The product of its digits is 8640, while the sum is 35.

The square root of 81151946 is about 9008.4374893763. The cubic root of 81151946 is about 432.9452503105.

The spelling of 81151946 in words is "eighty-one million, one hundred fifty-one thousand, nine hundred forty-six".