61986531 has 8 divisors (see below), whose sum is σ = 86998720. Its totient is φ = 39149352.

The previous prime is 61986523. The next prime is 61986571. The reversal of 61986531 is 13568916.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61986531 - 2³ = 61986523 is a prime.

It is a super-2 number, since 2×61986531² = 7684660050827922, 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 61986531.

It is not an unprimeable number, because it can be changed into a prime (61986511) 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, 543685 + ... + 543798.

It is an arithmetic number, because the mean of its divisors is an integer number (10874840).

Almost surely, 2^61986531 is an apocalyptic number.

61986531 is a deficient number, since it is larger than the sum of its proper divisors (25012189).

61986531 is a wasteful number, since it uses less digits than its factorization.

61986531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087505.

The product of its digits is 38880, while the sum is 39.

The square root of 61986531 is about 7873.1525452007. The cubic root of 61986531 is about 395.7604982246.

The spelling of 61986531 in words is "sixty-one million, nine hundred eighty-six thousand, five hundred thirty-one".