61531602 has 64 divisors (see below), whose sum is σ = 143420544. Its totient is φ = 17392640.

The previous prime is 61531583. The next prime is 61531607. The reversal of 61531602 is 20613516.

It is a super-2 number, since 2×61531602² = 7572276089372808, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61531607) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 193948 + ... + 194264.

It is an arithmetic number, because the mean of its divisors is an integer number (2240946).

Almost surely, 2^61531602 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61531602, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71710272).

61531602 is an abundant number, since it is smaller than the sum of its proper divisors (81888942).

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

61531602 is a wasteful number, since it uses less digits than its factorization.

61531602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 61531602 is about 7844.2081818371. The cubic root of 61531602 is about 394.7899369105.

The spelling of 61531602 in words is "sixty-one million, five hundred thirty-one thousand, six hundred two".