1905401231 has 2 divisors, whose sum is σ = 1905401232. Its totient is φ = 1905401230.

The previous prime is 1905401221. The next prime is 1905401273. The reversal of 1905401231 is 1321045091.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1905401231 is a prime.

It is a super-2 number, since 2×1905401231² = 7261107702192630722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1905401231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1905401221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 952700615 + 952700616.

It is an arithmetic number, because the mean of its divisors is an integer number (952700616).

Almost surely, 2^1905401231 is an apocalyptic number.

1905401231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1905401231 is an equidigital number, since it uses as much as digits as its factorization.

1905401231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1905401231 is about 43650.9018348991. The cubic root of 1905401231 is about 1239.7348615827.

The spelling of 1905401231 in words is "one billion, nine hundred five million, four hundred one thousand, two hundred thirty-one".