2015915749 has 4 divisors (see below), whose sum is σ = 2030418880. Its totient is φ = 2001412620.

The previous prime is 2015915729. The next prime is 2015915761. The reversal of 2015915749 is 9475195102.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9475195102 = 2 ⋅4737597551.

It is a cyclic number.

It is not a de Polignac number, because 2015915749 - 2¹⁹ = 2015391461 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 (2015915719) 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, 7251357 + ... + 7251634.

It is an arithmetic number, because the mean of its divisors is an integer number (507604720).

Almost surely, 2^2015915749 is an apocalyptic number.

It is an amenable number.

2015915749 is a deficient number, since it is larger than the sum of its proper divisors (14503131).

2015915749 is a wasteful number, since it uses less digits than its factorization.

2015915749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14503130.

The product of its (nonzero) digits is 113400, while the sum is 43.

The square root of 2015915749 is about 44898.9504220310. The cubic root of 2015915749 is about 1263.2543214153.

It can be divided in two parts, 2015 and 915749, that added together give a square (917764 = 958²).

The spelling of 2015915749 in words is "two billion, fifteen million, nine hundred fifteen thousand, seven hundred forty-nine".