20151401 has 4 divisors (see below), whose sum is σ = 20160912. Its totient is φ = 20141892.

The previous prime is 20151379. The next prime is 20151407. The reversal of 20151401 is 10415102.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20151401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20151407) 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, 26 + ... + 6348.

It is an arithmetic number, because the mean of its divisors is an integer number (5040228).

Almost surely, 2^20151401 is an apocalyptic number.

It is an amenable number.

20151401 is a deficient number, since it is larger than the sum of its proper divisors (9511).

20151401 is an equidigital number, since it uses as much as digits as its factorization.

20151401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9510.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 20151401 is about 4489.0311872385. The cubic root of 20151401 is about 272.1249831112.

Adding to 20151401 its reverse (10415102), we get a palindrome (30566503).

The spelling of 20151401 in words is "twenty million, one hundred fifty-one thousand, four hundred one".