61151540 has 12 divisors (see below), whose sum is σ = 128418276. Its totient is φ = 24460608.

The previous prime is 61151539. The next prime is 61151543. The reversal of 61151540 is 4515116.

It can be written as a sum of positive squares in 2 ways, for example, as 29724304 + 31427236 = 5452^2 + 5606^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61151543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1528769 + ... + 1528808.

It is an arithmetic number, because the mean of its divisors is an integer number (10701523).

Almost surely, 2^61151540 is an apocalyptic number.

It is an amenable number.

61151540 is an abundant number, since it is smaller than the sum of its proper divisors (67266736).

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

61151540 is a wasteful number, since it uses less digits than its factorization.

61151540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3057586 (or 3057584 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 61151540 is about 7819.9450125944. The cubic root of 61151540 is about 393.9754251294.

Adding to 61151540 its reverse (4515116), we get a palindrome (65666656).

The spelling of 61151540 in words is "sixty-one million, one hundred fifty-one thousand, five hundred forty".