1401111251 has 4 divisors (see below), whose sum is σ = 1408447104. Its totient is φ = 1393775400.

The previous prime is 1401111221. The next prime is 1401111259. The reversal of 1401111251 is 1521111041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1521111041 = 1697 ⋅896353.

It is a cyclic number.

It is not a de Polignac number, because 1401111251 - 2²⁶ = 1334002387 is a prime.

It is a super-2 number, since 2×1401111251² = 3926225475357570002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1401111259) 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, 3667640 + ... + 3668021.

It is an arithmetic number, because the mean of its divisors is an integer number (352111776).

Almost surely, 2^1401111251 is an apocalyptic number.

1401111251 is a deficient number, since it is larger than the sum of its proper divisors (7335853).

1401111251 is an equidigital number, since it uses as much as digits as its factorization.

1401111251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7335852.

The product of its (nonzero) digits is 40, while the sum is 17.

The square root of 1401111251 is about 37431.4206382820. The cubic root of 1401111251 is about 1118.9848505183.

Adding to 1401111251 its reverse (1521111041), we get a palindrome (2922222292).

The spelling of 1401111251 in words is "one billion, four hundred one million, one hundred eleven thousand, two hundred fifty-one".