61001140 has 24 divisors (see below), whose sum is σ = 128406600. Its totient is φ = 24342528.

The previous prime is 61001137. The next prime is 61001147. The reversal of 61001140 is 4110016.

It can be written as a sum of positive squares in 4 ways, for example, as 1340964 + 59660176 = 1158^2 + 7724^2 .

It is a super-2 number, since 2×61001140² = 7442278162599200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61001140.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61001147) 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, 5584 + ... + 12376.

It is an arithmetic number, because the mean of its divisors is an integer number (5350275).

Almost surely, 2^61001140 is an apocalyptic number.

It is an amenable number.

61001140 is an abundant number, since it is smaller than the sum of its proper divisors (67405460).

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

61001140 is a wasteful number, since it uses less digits than its factorization.

61001140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7251 (or 7249 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 61001140 is about 7810.3226565872. The cubic root of 61001140 is about 393.6521705391.

Adding to 61001140 its reverse (4110016), we get a palindrome (65111156).

The spelling of 61001140 in words is "sixty-one million, one thousand, one hundred forty".