61211136 has 80 divisors (see below), whose sum is σ = 186398784. Its totient is φ = 17485824.

The previous prime is 61211113. The next prime is 61211167. The reversal of 61211136 is 63111216.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7906 + ... + 13598.

Almost surely, 2^61211136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61211136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93199392).

61211136 is an abundant number, since it is smaller than the sum of its proper divisors (125187648).

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

61211136 is an equidigital number, since it uses as much as digits as its factorization.

61211136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5721 (or 5705 counting only the distinct ones).

The product of its digits is 216, while the sum is 21.

The square root of 61211136 is about 7823.7545973784. The cubic root of 61211136 is about 394.1033681390.

The spelling of 61211136 in words is "sixty-one million, two hundred eleven thousand, one hundred thirty-six".