102156554 has 4 divisors (see below), whose sum is σ = 153234834. Its totient is φ = 51078276.

The previous prime is 102156539. The next prime is 102156557. The reversal of 102156554 is 455651201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 455651201 = 509 ⋅895189.

It can be written as a sum of positive squares in only one way, i.e., 88266025 + 13890529 = 9395^2 + 3727^2 .

It is not an unprimeable number, because it can be changed into a prime (102156557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25539137 + ... + 25539140.

Almost surely, 2^102156554 is an apocalyptic number.

102156554 is a deficient number, since it is larger than the sum of its proper divisors (51078280).

102156554 is an equidigital number, since it uses as much as digits as its factorization.

102156554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51078279.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 102156554 is about 10107.2525445840. The cubic root of 102156554 is about 467.4717936980.

It can be divided in two parts, 1021 and 56554, that added together give a palindrome (57575).

The spelling of 102156554 in words is "one hundred two million, one hundred fifty-six thousand, five hundred fifty-four".