971615 has 4 divisors (see below), whose sum is σ = 1165944. Its totient is φ = 777288.

The previous prime is 971591. The next prime is 971639. The reversal of 971615 is 516179.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (971591) and next prime (971639).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-971615 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97157 + ... + 97166.

It is an arithmetic number, because the mean of its divisors is an integer number (291486).

2⁹⁷¹⁶¹⁵ is an apocalyptic number.

971615 is a deficient number, since it is larger than the sum of its proper divisors (194329).

971615 is a wasteful number, since it uses less digits than its factorization.

971615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194328.

The product of its digits is 1890, while the sum is 29.

The square root of 971615 is about 985.7053312223. The cubic root of 971615 is about 99.0447371184.

The spelling of 971615 in words is "nine hundred seventy-one thousand, six hundred fifteen".