100515551 has 2 divisors, whose sum is σ = 100515552. Its totient is φ = 100515550.

The previous prime is 100515539. The next prime is 100515581. The reversal of 100515551 is 155515001.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100515551 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100515521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50257775 + 50257776.

It is an arithmetic number, because the mean of its divisors is an integer number (50257776).

Almost surely, 2^100515551 is an apocalyptic number.

100515551 is a deficient number, since it is larger than the sum of its proper divisors (1).

100515551 is an equidigital number, since it uses as much as digits as its factorization.

100515551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 625, while the sum is 23.

The square root of 100515551 is about 10025.7444112644. The cubic root of 100515551 is about 464.9551750833.

The spelling of 100515551 in words is "one hundred million, five hundred fifteen thousand, five hundred fifty-one".