61343131 has 8 divisors (see below), whose sum is σ = 62760960. Its totient is φ = 59930088.

The previous prime is 61343111. The next prime is 61343137. The reversal of 61343131 is 13134316.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 61343131 - 2¹⁵ = 61310363 is a prime.

It is a super-2 number, since 2×61343131² = 7525959441766322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61343137) 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, 41910 + ... + 43348.

It is an arithmetic number, because the mean of its divisors is an integer number (7845120).

Almost surely, 2^61343131 is an apocalyptic number.

61343131 is a deficient number, since it is larger than the sum of its proper divisors (1417829).

61343131 is a wasteful number, since it uses less digits than its factorization.

61343131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2393.

The product of its digits is 648, while the sum is 22.

The square root of 61343131 is about 7832.1855825817. The cubic root of 61343131 is about 394.3864447742.

Adding to 61343131 its reverse (13134316), we get a palindrome (74477447).

The spelling of 61343131 in words is "sixty-one million, three hundred forty-three thousand, one hundred thirty-one".