61521042 has 48 divisors (see below), whose sum is σ = 137281248. Its totient is φ = 18224640.

The previous prime is 61521029. The next prime is 61521043. The reversal of 61521042 is 24012516.

It is not an unprimeable number, because it can be changed into a prime (61521043) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 544378 + ... + 544490.

It is an arithmetic number, because the mean of its divisors is an integer number (2860026).

Almost surely, 2^61521042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61521042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68640624).

61521042 is an abundant number, since it is smaller than the sum of its proper divisors (75760206).

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

61521042 is a wasteful number, since it uses less digits than its factorization.

61521042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315 (or 202 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 61521042 is about 7843.5350448634. The cubic root of 61521042 is about 394.7673511165.

Adding to 61521042 its reverse (24012516), we get a palindrome (85533558).

The spelling of 61521042 in words is "sixty-one million, five hundred twenty-one thousand, forty-two".