400151021491 has 8 divisors (see below), whose sum is σ = 431059675760. Its totient is φ = 369260625312.

The previous prime is 400151021489. The next prime is 400151021507. The reversal of 400151021491 is 194120151004.

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 400151021491 - 2¹ = 400151021489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400151021441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4518981 + ... + 4606678.

It is an arithmetic number, because the mean of its divisors is an integer number (53882459470).

Almost surely, 2^400151021491 is an apocalyptic number.

400151021491 is a deficient number, since it is larger than the sum of its proper divisors (30908654269).

400151021491 is a wasteful number, since it uses less digits than its factorization.

400151021491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9129045.

The product of its (nonzero) digits is 1440, while the sum is 28.

Adding to 400151021491 its reverse (194120151004), we get a palindrome (594271172495).

The spelling of 400151021491 in words is "four hundred billion, one hundred fifty-one million, twenty-one thousand, four hundred ninety-one".