61438613 has 4 divisors (see below), whose sum is σ = 62002380. Its totient is φ = 60874848.

The previous prime is 61438583. The next prime is 61438633. The reversal of 61438613 is 31683416.

61438613 = 5542² + 5543².

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

It can be written as a sum of positive squares in 2 ways, for example, as 30713764 + 30724849 = 5542^2 + 5543^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61438613 is a prime.

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 61438613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61438633) 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, 281720 + ... + 281937.

It is an arithmetic number, because the mean of its divisors is an integer number (15500595).

Almost surely, 2^61438613 is an apocalyptic number.

61438613 is the 5543-rd centered square number.

It is an amenable number.

61438613 is a deficient number, since it is larger than the sum of its proper divisors (563767).

61438613 is a wasteful number, since it uses less digits than its factorization.

61438613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563766.

The product of its digits is 10368, while the sum is 32.

The square root of 61438613 is about 7838.2787013476. The cubic root of 61438613 is about 394.5909625683.

The spelling of 61438613 in words is "sixty-one million, four hundred thirty-eight thousand, six hundred thirteen".