61361531 has 16 divisors (see below), whose sum is σ = 76704000. Its totient is φ = 47688480.

The previous prime is 61361501. The next prime is 61361533. The reversal of 61361531 is 13516316.

It is not a de Polignac number, because 61361531 - 2¹⁴ = 61345147 is a prime.

It is a super-2 number, since 2×61361531² = 7530474973327922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61361531.

It is not an unprimeable number, because it can be changed into a prime (61361533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37625 + ... + 39221.

It is an arithmetic number, because the mean of its divisors is an integer number (4794000).

Almost surely, 2^61361531 is an apocalyptic number.

61361531 is a deficient number, since it is larger than the sum of its proper divisors (15342469).

61361531 is a wasteful number, since it uses less digits than its factorization.

61361531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2114.

The product of its digits is 1620, while the sum is 26.

The square root of 61361531 is about 7833.3601347059. The cubic root of 61361531 is about 394.4258731777.

Adding to 61361531 its reverse (13516316), we get a palindrome (74877847).

It can be divided in two parts, 6136 and 1531, that added together give a palindrome (7667).

The spelling of 61361531 in words is "sixty-one million, three hundred sixty-one thousand, five hundred thirty-one".