615881413 has 4 divisors (see below), whose sum is σ = 703864480. Its totient is φ = 527898348.

The previous prime is 615881411. The next prime is 615881429. The reversal of 615881413 is 314188516.

615881413 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 615881413 - 2¹ = 615881411 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 (615881411) 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, 43991523 + ... + 43991536.

It is an arithmetic number, because the mean of its divisors is an integer number (175966120).

Almost surely, 2^615881413 is an apocalyptic number.

It is an amenable number.

615881413 is a deficient number, since it is larger than the sum of its proper divisors (87983067).

615881413 is an equidigital number, since it uses as much as digits as its factorization.

615881413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87983066.

The product of its digits is 23040, while the sum is 37.

The square root of 615881413 is about 24816.9581737972. The cubic root of 615881413 is about 850.8095691782.

It can be divided in two parts, 61588 and 1413, that added together give a square (63001 = 251²).

The spelling of 615881413 in words is "six hundred fifteen million, eight hundred eighty-one thousand, four hundred thirteen".