61313381 has 8 divisors (see below), whose sum is σ = 63577344. Its totient is φ = 59067360.

The previous prime is 61313353. The next prime is 61313387. The reversal of 61313381 is 18331316.

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 61313381 - 2¹⁰ = 61312357 is a prime.

It is a super-2 number, since 2×61313381² = 7518661379302322, 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 61313381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61313387) 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, 2681 + ... + 11393.

It is an arithmetic number, because the mean of its divisors is an integer number (7947168).

Almost surely, 2^61313381 is an apocalyptic number.

It is an amenable number.

61313381 is a deficient number, since it is larger than the sum of its proper divisors (2263963).

61313381 is a wasteful number, since it uses less digits than its factorization.

61313381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8971.

The product of its digits is 1296, while the sum is 26.

The square root of 61313381 is about 7830.2861378113. The cubic root of 61313381 is about 394.3226783628.

Adding to 61313381 its reverse (18331316), we get a palindrome (79644697).

The spelling of 61313381 in words is "sixty-one million, three hundred thirteen thousand, three hundred eighty-one".