61162531 has 4 divisors (see below), whose sum is σ = 61182864. Its totient is φ = 61142200.

The previous prime is 61162513. The next prime is 61162547. The reversal of 61162531 is 13526116.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61162531 - 2⁷ = 61162403 is a prime.

It is a super-2 number, since 2×61162531² = 7481710396651922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61162496 and 61162505.

It is not an unprimeable number, because it can be changed into a prime (61162561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4660 + ... + 12001.

It is an arithmetic number, because the mean of its divisors is an integer number (15295716).

Almost surely, 2^61162531 is an apocalyptic number.

61162531 is the 3498-th centered decagonal number.

61162531 is a deficient number, since it is larger than the sum of its proper divisors (20333).

61162531 is a wasteful number, since it uses less digits than its factorization.

61162531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20332.

The product of its digits is 1080, while the sum is 25.

The square root of 61162531 is about 7820.6477353222. The cubic root of 61162531 is about 393.9990272851. Note that the first 3 decimals are identical.

Adding to 61162531 its reverse (13526116), we get a palindrome (74688647).

The spelling of 61162531 in words is "sixty-one million, one hundred sixty-two thousand, five hundred thirty-one".