1973531 has 4 divisors (see below), whose sum is σ = 2255472. Its totient is φ = 1691592.

The previous prime is 1973527. The next prime is 1973539. The reversal of 1973531 is 1353791.

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

It is not a de Polignac number, because 1973531 - 2² = 1973527 is a prime.

It is a super-2 number, since 2×1973531² = 7789649215922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1973494 and 1973503.

It is not an unprimeable number, because it can be changed into a prime (1973539) 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, 140960 + ... + 140973.

It is an arithmetic number, because the mean of its divisors is an integer number (563868).

2^1973531 is an apocalyptic number.

1973531 is a deficient number, since it is larger than the sum of its proper divisors (281941).

1973531 is an equidigital number, since it uses as much as digits as its factorization.

1973531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281940.

The product of its digits is 2835, while the sum is 29.

The square root of 1973531 is about 1404.8241882883. The cubic root of 1973531 is about 125.4338206553.

The spelling of 1973531 in words is "one million, nine hundred seventy-three thousand, five hundred thirty-one".