4020123251 has 2 divisors, whose sum is σ = 4020123252. Its totient is φ = 4020123250.

The previous prime is 4020123221. The next prime is 4020123313. The reversal of 4020123251 is 1523210204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4020123251 - 2⁶ = 4020123187 is a prime.

It is a super-2 number, since 2×4020123251² = 32322781906461618002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4020123221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010061625 + 2010061626.

It is an arithmetic number, because the mean of its divisors is an integer number (2010061626).

Almost surely, 2^4020123251 is an apocalyptic number.

4020123251 is a deficient number, since it is larger than the sum of its proper divisors (1).

4020123251 is an equidigital number, since it uses as much as digits as its factorization.

4020123251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 4020123251 is about 63404.4418869845. The cubic root of 4020123251 is about 1590.0585729250.

Adding to 4020123251 its reverse (1523210204), we get a palindrome (5543333455).

The spelling of 4020123251 in words is "four billion, twenty million, one hundred twenty-three thousand, two hundred fifty-one".