20251101551 has 2 divisors, whose sum is σ = 20251101552. Its totient is φ = 20251101550.

The previous prime is 20251101523. The next prime is 20251101589. The reversal of 20251101551 is 15510115202.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20251101551 is a prime.

It is a super-2 number, since 2×20251101551² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20251101251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10125550775 + 10125550776.

It is an arithmetic number, because the mean of its divisors is an integer number (10125550776).

Almost surely, 2^20251101551 is an apocalyptic number.

20251101551 is a deficient number, since it is larger than the sum of its proper divisors (1).

20251101551 is an equidigital number, since it uses as much as digits as its factorization.

20251101551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 500, while the sum is 23.

Adding to 20251101551 its reverse (15510115202), we get a palindrome (35761216753).

The spelling of 20251101551 in words is "twenty billion, two hundred fifty-one million, one hundred one thousand, five hundred fifty-one".