1201121491 has 8 divisors (see below), whose sum is σ = 1235139840. Its totient is φ = 1167185088.

The previous prime is 1201121489. The next prime is 1201121501. The reversal of 1201121491 is 1941211021.

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 1201121491 - 2¹ = 1201121489 is a prime.

It is a super-2 number, since 2×1201121491² = 2885385672284126162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201121401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9870 + ... + 49996.

It is an arithmetic number, because the mean of its divisors is an integer number (154392480).

Almost surely, 2^1201121491 is an apocalyptic number.

1201121491 is a deficient number, since it is larger than the sum of its proper divisors (34018349).

1201121491 is an equidigital number, since it uses as much as digits as its factorization.

1201121491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40973.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 1201121491 is about 34657.1996993410. The cubic root of 1201121491 is about 1062.9895111132.

The spelling of 1201121491 in words is "one billion, two hundred one million, one hundred twenty-one thousand, four hundred ninety-one".