101861551 has 12 divisors (see below), whose sum is σ = 112606312. Its totient is φ = 92070000.

The previous prime is 101861537. The next prime is 101861579. The reversal of 101861551 is 155168101.

It is not a de Polignac number, because 101861551 - 2¹¹ = 101859503 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101861051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19576 + ... + 24226.

Almost surely, 2^101861551 is an apocalyptic number.

101861551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

101861551 is a deficient number, since it is larger than the sum of its proper divisors (10744761).

101861551 is a wasteful number, since it uses less digits than its factorization.

101861551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4854 (or 4843 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 28.

The square root of 101861551 is about 10092.6483640321. The cubic root of 101861551 is about 467.0213786721.

The spelling of 101861551 in words is "one hundred one million, eight hundred sixty-one thousand, five hundred fifty-one".