81261050 has 24 divisors (see below), whose sum is σ = 162773436. Its totient is φ = 30003840.

The previous prime is 81261049. The next prime is 81261079. The reversal of 81261050 is 5016218.

It can be written as a sum of positive squares in 6 ways, for example, as 2211169 + 79049881 = 1487^2 + 8891^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61859 + ... + 63158.

Almost surely, 2^81261050 is an apocalyptic number.

81261050 is an abundant number, since it is smaller than the sum of its proper divisors (81512386).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81261050 is a wasteful number, since it uses less digits than its factorization.

81261050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125042 (or 125037 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 81261050 is about 9014.4911115381. The cubic root of 81261050 is about 433.1391865335.

Adding to 81261050 its reverse (5016218), we get a palindrome (86277268).

The spelling of 81261050 in words is "eighty-one million, two hundred sixty-one thousand, fifty".