102581551 has 4 divisors (see below), whose sum is σ = 107980600. Its totient is φ = 97182504.

The previous prime is 102581533. The next prime is 102581603. The reversal of 102581551 is 155185201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 102581551 - 2¹⁷ = 102450479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102581051) 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, 2699496 + ... + 2699533.

It is an arithmetic number, because the mean of its divisors is an integer number (26995150).

Almost surely, 2^102581551 is an apocalyptic number.

102581551 is a deficient number, since it is larger than the sum of its proper divisors (5399049).

102581551 is an equidigital number, since it uses as much as digits as its factorization.

102581551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5399048.

The product of its (nonzero) digits is 2000, while the sum is 28.

The square root of 102581551 is about 10128.2550817009. The cubic root of 102581551 is about 468.1191635948.

The spelling of 102581551 in words is "one hundred two million, five hundred eighty-one thousand, five hundred fifty-one".