61306331 has 4 divisors (see below), whose sum is σ = 64533000. Its totient is φ = 58079664.

The previous prime is 61306309. The next prime is 61306351. The reversal of 61306331 is 13360316.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61306331 is a prime.

It is a super-2 number, since 2×61306331² = 7516932441363122, 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 = 61306297 and 61306306.

It is not an unprimeable number, because it can be changed into a prime (61306351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1613306 + ... + 1613343.

It is an arithmetic number, because the mean of its divisors is an integer number (16133250).

Almost surely, 2^61306331 is an apocalyptic number.

61306331 is a deficient number, since it is larger than the sum of its proper divisors (3226669).

61306331 is a wasteful number, since it uses less digits than its factorization.

61306331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3226668.

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 61306331 is about 7829.8359497502. The cubic root of 61306331 is about 394.3075643078.

Adding to 61306331 its reverse (13360316), we get a palindrome (74666647).

The spelling of 61306331 in words is "sixty-one million, three hundred six thousand, three hundred thirty-one".