61377213 has 4 divisors (see below), whose sum is σ = 81836288. Its totient is φ = 40918140.

The previous prime is 61377209. The next prime is 61377247. The reversal of 61377213 is 31277316.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 61377213 - 2² = 61377209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61377203) 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, 10229533 + ... + 10229538.

It is an arithmetic number, because the mean of its divisors is an integer number (20459072).

Almost surely, 2^61377213 is an apocalyptic number.

It is an amenable number.

61377213 is a deficient number, since it is larger than the sum of its proper divisors (20459075).

61377213 is a wasteful number, since it uses less digits than its factorization.

61377213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20459074.

The product of its digits is 5292, while the sum is 30.

The square root of 61377213 is about 7834.3610460586. The cubic root of 61377213 is about 394.4594710991.

The spelling of 61377213 in words is "sixty-one million, three hundred seventy-seven thousand, two hundred thirteen".