81437049 has 16 divisors (see below), whose sum is σ = 121376640. Its totient is φ = 53963280.

The previous prime is 81437039. The next prime is 81437063. The reversal of 81437049 is 94073418.

It is a happy number.

It is not a de Polignac number, because 81437049 - 2⁷ = 81436921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81437009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4522 + ... + 13539.

It is an arithmetic number, because the mean of its divisors is an integer number (7586040).

Almost surely, 2^81437049 is an apocalyptic number.

It is an amenable number.

81437049 is a deficient number, since it is larger than the sum of its proper divisors (39939591).

81437049 is a wasteful number, since it uses less digits than its factorization.

81437049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18237 (or 18231 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 81437049 is about 9024.2478356925. The cubic root of 81437049 is about 433.4516654483.

The spelling of 81437049 in words is "eighty-one million, four hundred thirty-seven thousand, forty-nine".