61213973219391 has 8 divisors (see below), whose sum is σ = 81618734635264. Its totient is φ = 40809263641560.

The previous prime is 61213973219381. The next prime is 61213973219417. The reversal of 61213973219391 is 19391237931216.

It is a happy number.

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

It is not a de Polignac number, because 61213973219391 - 2¹³ = 61213973211199 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 (61213973219351) 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, 10114951 + ... + 14991336.

It is an arithmetic number, because the mean of its divisors is an integer number (10202341829408).

Almost surely, 2^{61213973219391} is an apocalyptic number.

61213973219391 is a deficient number, since it is larger than the sum of its proper divisors (20404761415873).

61213973219391 is a wasteful number, since it uses less digits than its factorization.

61213973219391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25919021.

The product of its digits is 3306744, while the sum is 57.

The spelling of 61213973219391 in words is "sixty-one trillion, two hundred thirteen billion, nine hundred seventy-three million, two hundred nineteen thousand, three hundred ninety-one".