1961515 has 8 divisors (see below), whose sum is σ = 2373120. Its totient is φ = 1556352.

The previous prime is 1961513. The next prime is 1961527. The reversal of 1961515 is 5151691.

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

It is a cyclic number.

It is not a de Polignac number, because 1961515 - 2¹ = 1961513 is a prime.

1961515 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1961513) 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, 910 + ... + 2179.

It is an arithmetic number, because the mean of its divisors is an integer number (296640).

2^1961515 is an apocalyptic number.

1961515 is a deficient number, since it is larger than the sum of its proper divisors (411605).

1961515 is a wasteful number, since it uses less digits than its factorization.

1961515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3221.

The product of its digits is 1350, while the sum is 28.

The square root of 1961515 is about 1400.5409669124. The cubic root of 1961515 is about 125.1787309867.

It can be divided in two parts, 196 and 1515, that added together give a triangular number (1711 = T₅₈).

The spelling of 1961515 in words is "one million, nine hundred sixty-one thousand, five hundred fifteen".