612541381 has 4 divisors (see below), whose sum is σ = 613189152. Its totient is φ = 611893612.

The previous prime is 612541379. The next prime is 612541387. The reversal of 612541381 is 183145216.

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 a cyclic number.

It is not a de Polignac number, because 612541381 - 2¹ = 612541379 is a prime.

It is a super-2 number, since 2×612541381² = 750413886874774322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612541387) 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, 322465 + ... + 324358.

It is an arithmetic number, because the mean of its divisors is an integer number (153297288).

Almost surely, 2^612541381 is an apocalyptic number.

It is an amenable number.

612541381 is a deficient number, since it is larger than the sum of its proper divisors (647771).

612541381 is an equidigital number, since it uses as much as digits as its factorization.

612541381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647770.

The product of its digits is 5760, while the sum is 31.

The square root of 612541381 is about 24749.5733498580. The cubic root of 612541381 is about 849.2687510229.

Adding to 612541381 its reverse (183145216), we get a palindrome (795686597).

The spelling of 612541381 in words is "six hundred twelve million, five hundred forty-one thousand, three hundred eighty-one".