1961158 has 4 divisors (see below), whose sum is σ = 2941740. Its totient is φ = 980578.

The previous prime is 1961147. The next prime is 1961173. The reversal of 1961158 is 8511691.

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

It is a super-2 number, since 2×1961158² = 7692281401928, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490288 + ... + 490291.

It is an arithmetic number, because the mean of its divisors is an integer number (735435).

2^1961158 is an apocalyptic number.

1961158 is a deficient number, since it is larger than the sum of its proper divisors (980582).

1961158 is an equidigital number, since it uses as much as digits as its factorization.

1961158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980581.

The product of its digits is 2160, while the sum is 31.

The square root of 1961158 is about 1400.4135103604. The cubic root of 1961158 is about 125.1711362588.

The spelling of 1961158 in words is "one million, nine hundred sixty-one thousand, one hundred fifty-eight".