81949046 has 16 divisors (see below), whose sum is σ = 128491488. Its totient is φ = 39124800.

The previous prime is 81949019. The next prime is 81949051. The reversal of 81949046 is 64094918.

It is a super-2 number, since 2×81949046² = 13431292280620232, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81948994 and 81949012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33836 + ... + 36176.

It is an arithmetic number, because the mean of its divisors is an integer number (8030718).

Almost surely, 2^81949046 is an apocalyptic number.

81949046 is a deficient number, since it is larger than the sum of its proper divisors (46542442).

81949046 is a wasteful number, since it uses less digits than its factorization.

81949046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3127.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 81949046 is about 9052.5712369470. The cubic root of 81949046 is about 434.3581426510.

The spelling of 81949046 in words is "eighty-one million, nine hundred forty-nine thousand, forty-six".