1997151 has 16 divisors (see below), whose sum is σ = 2940000. Its totient is φ = 1198080.

The previous prime is 1997141. The next prime is 1997161. The reversal of 1997151 is 1517991.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1997141) and next prime (1997161).

It is not a de Polignac number, because 1997151 - 2⁵ = 1997119 is a prime.

It is a super-2 number, since 2×1997151² = 7977224233602, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 975 + ... + 2223.

It is an arithmetic number, because the mean of its divisors is an integer number (183750).

2^1997151 is an apocalyptic number.

1997151 is a deficient number, since it is larger than the sum of its proper divisors (942849).

1997151 is a wasteful number, since it uses less digits than its factorization.

1997151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1306.

The product of its digits is 2835, while the sum is 33.

The square root of 1997151 is about 1413.2059297923. The cubic root of 1997151 is about 125.9322513088.

The spelling of 1997151 in words is "one million, nine hundred ninety-seven thousand, one hundred fifty-one".