1491441401 has 4 divisors (see below), whose sum is σ = 1493698404. Its totient is φ = 1489184400.

The previous prime is 1491441397. The next prime is 1491441409. The reversal of 1491441401 is 1041441941.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1332177001 + 159264400 = 36499^2 + 12620^2 .

It is a cyclic number.

It is not a de Polignac number, because 1491441401 - 2² = 1491441397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1491441409) 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, 1127510 + ... + 1128831.

It is an arithmetic number, because the mean of its divisors is an integer number (373424601).

Almost surely, 2^1491441401 is an apocalyptic number.

It is an amenable number.

1491441401 is a deficient number, since it is larger than the sum of its proper divisors (2257003).

1491441401 is an equidigital number, since it uses as much as digits as its factorization.

1491441401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2257002.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 1491441401 is about 38619.1843647688. The cubic root of 1491441401 is about 1142.5329441603.

The spelling of 1491441401 in words is "one billion, four hundred ninety-one million, four hundred forty-one thousand, four hundred one".