1000155401 has 4 divisors (see below), whose sum is σ = 1143034752. Its totient is φ = 857276052.

The previous prime is 1000155323. The next prime is 1000155419. The reversal of 1000155401 is 1045510001.

1000155401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1000155401 - 2¹⁴ = 1000139017 is a prime.

It is a super-2 number, since 2×1000155401² = 2000621652298941602, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1000155401.

It is not an unprimeable number, because it can be changed into a prime (1000155491) 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, 71439665 + ... + 71439678.

It is an arithmetic number, because the mean of its divisors is an integer number (285758688).

Almost surely, 2^1000155401 is an apocalyptic number.

It is an amenable number.

1000155401 is a deficient number, since it is larger than the sum of its proper divisors (142879351).

1000155401 is an equidigital number, since it uses as much as digits as its factorization.

1000155401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142879350.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 1000155401 is about 31625.2336117854. The cubic root of 1000155401 is about 1000.0517976503.

Adding to 1000155401 its reverse (1045510001), we get a palindrome (2045665402).

The spelling of 1000155401 in words is "one billion, one hundred fifty-five thousand, four hundred one".